In the references section of the document you have the following:
PLT MzLib Dorai Sitaram, Bruce Hauman, Jens Axel Søgaard Gann Bierner,
and Kurt Howard: PLT MzLib: Libraries Manual
1) These are not the authors of this manual. They are the names listed
in the acknowledgments section. No explicit author names are given so I
would cite it simply as "PLT MzLib: Libraries Manual" with the URL.
2) There are no references to PLT or MzLib in the document so far as I