I happen to have this exact book out from the library right now. Let me tell you what I intend to do with it.
If you look at pages xi-xv, you’ll see that he lists the apocryphal texts he deals with in the book, the probable dates they were written, and what they are about. I haven’t searched for all of them yet, but I am pretty sure that you can find them all in translation either on the web or in print.
As I read through the book, I’ll reference the source material to see if I agree with his interpretations. Then I’m going to read other people’s perspectives on the subject to see if his conclusions are widely accepted or wildly speculative.
When seeking out contrasting opinions, I usually look for good credentials, close reading of the source texts, and experts from a variety of faiths. Finally, I’ll decide which interpretation seems to be the best.
It is a lot more work than merely reading the opinions that I already agree with, but it is more satisfying in the end.