We cited and referenced about 750 papers, almost all of which are peer reviewed. These are not secondary references (where our citations are re-citations of what other writers may have cited); we read them first hand and have copies of all.
All of the work from my own laboratory and research group that is cited in the book was published in peer reviewed professional journals–and many in the very best peer reviewed journals.
I am the author of hundreds of peer reviewed articles–you can find about 125 of them listed by the National Library of Medicine on their website.
I, myself, have been a “peer”–in two ways. At various times during my career, I was on 5 professional journal editorial boards that “peer-reviewed” the work of others that was being submitted and considered for publication. Second, I was on several grant review panels, as a peer, deciding what research applications submitted by others should be funded (at NIH, these panels are called ‘study sections’).
I submitted our book manuscript for peer review to several very eminent science colleagues and they contributed ‘praises’ that are listed in the book. They include a Nobel Laureate (now Vice Provost for Research at an Ivy League school), a former university president (who himself was chair of the main advisory committee of university presidents), the former Executive Director of the prestigious Food and Nutrition Board (among other appointments), the senior advisor for the environment to the president of the World Bank etc. This is a very distinguished panel of peers.