call the bis at 1-800-rig-mkts, page-20

Timber;

en.wikipedia.org/wiki/Primary_source

This reference is a great example of a secondary source, as per all Wikipedia articles!

Slightly off topic, but I edited a Wikipedia article last August to something completely fabricated, so a few mates and I could have a laugh at a colleagues expense. Not only has this edit been allowed to stand for over 6 months, a quick google search reveals others have conducted their research on this topic on Wikipedia, and the fabricated fact now appears on over 500 other websites as true.

Let this serve as a lesson to all those who reference the good old Wikipedia.