Posted: Nov 03, 2012 1:51 pm
If I use a preface or any other material contributed by a different author, I'll credit it in the bibliography, usually by adding something like "preface and end notes by B", then when quoting, I'll say something like (B, in: A, W, pp. 4-5). If the preface is substantial and I want to make more than a passing reference to it, I'll list it as a separate entry. In any case, it should be made clear who wrote the text you're referring to.