Okay, there is reference outside of the Bible. The Ipuwer Papyrus was discovered in the 1800's and parts of it parallel the Biblical description:
The following is from
http://www.konig.org/wc52.htm. It gives the historical side of the papyrus, along with a comparison to the Bible.
Many people do not believe the Exodus took place. They often claim that there is no historical evidence, other than that found in the Bible. But there is evidence of the Exodus as stated by Grant Jeffrey in his book "Unveiling Mysteries of the Bible". An important Egyptian historical manuscript was discovered in Egypt more than a century ago.
Remarkably, this ancient papyrus parallels the history of the Exodus account as found in the Scriptures. This manuscript recorded the writings of an ancient Egyptian named Ipuwer. The papyrus manuscript, now called the Ipuwer Papyrus, was discovered by someone named Anastasi in the area of Memphis, near the pyramids of Saqqara in Egypt.
The museum of Leiden in the Netherlands acquired the papyrus in 1828. It was translated and published in English for the first time in 1909 by Professor Alan H. Gardiner. Gardiner wrote that the manuscript was one that recorded a genuine historical catastrophe when the whole country of Egypt was in distress and violence. "It is no merely local disturbance that is here described, but a great and overwhelming national disaster."
Gardiner suggests that Ipuwer was an Egyptian sage who directed his writing to the king as a complaint that the national catastrophe was in part caused by the king’s failure to act and deal with the crisis.
A comparison of several key passages from the Biblical Book of Exodus with the ancient Egyptian papyrus reveals remarkable correspondences and parallels that point to a real historical catastrophe.
1. The Plague of Blood
In Ipuwer Papyrus 2:5-6, it says: Plague is throughout the land. Blood is everywhere. Compare this with the Book of Exodus 7:21: There was blood throughout all the land of Egypt.
In Ipuwer Papyrus 2:10, it says: The River is Blood. Compare with Exodus 7:20: All the waters that were in the river were turned to blood.
In Ipuwer Papyrus 2:10, it says: Men shrank from tasting...and thirst for water. Compare with Exodus 7:24: And all the Egyptians digged round about the river for water to drink; for they could not drink of the water of the river.
2. The Plague of Hail
Ipuwer papyrus 9:23: The fire ran along the ground. There was hail, and fire mingled with the hail. Exodus 9:25: And the hail smote every herb on the field, and brake every tree in the field.
3. The Plague of Darkness
Ipuwer Papyrus 9:11: The land is not light. Exodus 10:22: And there was a thick darkness in all the land of Egypt.
4. The Plague of Egyptian Cattle
Ipuwer papyrus 5:5: All animals, their hearts weep. Cattle moan. Exodus 9:3: Behold, the hand of the Lord is upon thy cattle which is in the field, upon the horses, upon the asses, upon the camels, upon the oxen, and upon the sheep: there shall be grievous murrain (disease).
5. The Plague of the Firstborn of Egypt
Ipuwer Papyrus 2:13: He who places his brother in the ground is everywhere. Exodus 12:27: He (the angel of the Lord) smote the Egyptians. Ipuwer Papyrus 4:3: Forsooth, the children of princes are dashed against the walls. Exodus 12:29: At midnight the Lord smote all the firstborn in the land of Egypt. Ipuwer Papyrus 6:12: Forsooth, the children of the princes are cast out in the streets, Exodus 12:30: There was not a house where there was not one dead.
6. Response of the Egyptians to the Loss of their First born
Ipuwer Papyrus 3:14: It is groaning that is throughout the land, mingled with lamentations. Exodus 12:30: There was a great cry in Egypt.
In light of the ample evidence accumulated from ancient Jewish and Greek historians, together with the Ipuwer Papyrus that parallels several of the 10 Biblical plagues, it is clear that there is compelling non-Biblical evidence to confirm the scriptural account about the Exodus of the Jews from Egypt. Further proof of the Exodus is the fact; the Jews have annually celebrated three great festivals in commemoration of their Exodus (Passover, Pentecost, and Tabernacles) for 3500 years. Therefore, logically, the public observance of the Exodus Passover festival can only be explained if the Jewish people actually participated in these historical events as recorded in the Torah, the first five books of the Bible.
The entire papyrus can be read here:
http://members.tripod.com/~Raseneb/Ipuwer.htm