an article contemporaneous to the event in a journal of record should do it too.
See if you can find the report in the NY Times.
Not that I'm advocating it, but if you know the day it happened, you can be fairly sure it was in the times that week, and fairly sure people wont look up your references, so if you were foolish enough to make the up, you'd not be found out in most cases, but on the downside it is accademic fraud.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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