This is weird: the Little Brown Handbook mentions, several times in a row, People Magazine. Though this may be a random choice for use in their examples, something about it struck me as odd, especially the sentence "Do your own critical reading of People or another magazine." Though the Little, Brown Handbook suggests "another magazine," they specifically mention People there. Why? (page 164, tenth edition)
Further, on page 198 (tenth edition), they specifically state, as part of an assignment, to go to groups.yahoo.com. Again, why?
These two instances look a bit like mild advertising to me. I do not know, as I have no knowledge of any deals Yahoo or People may have made with the makers of The Little, Brown Handbook. However, it is interesting (and, if these are indeed advertisements of a kind, ironic) that they occur in chapters dedicated to analyzing sources for, amongst other things, that kind of content.