Just for fun, I went through this book and counted up how many of the species I have seen. There are 120 species in the book and, as noted, it is very splitty so I don't agree personally with the number they have (e.g. the Ebony Langur of Java is split into western and eastern species, Bornean Gibbon is split into three species, Bornean Slow Loris is split into four species, etc).The other book, "A Naturalist's Guide to the Primates of Southeast Asia, East Asia and the Indian Sub-Continent" is really good. Paperback, quite small, published 2017. The species accounts are quite short and basic. It is very splitty, but every species is illustrated with photos, most of which are excellent. Most of them are of wild animals but there are a few captives of the rarer species. The Shortridge's Langur illustrated in the book is the same individual I've seen at Yadanabon Zoo in Burma. My only criticism is simply that there is no information about where to see any of the species, other than covering their distributions. There is a very brief chapter on primate-watching but it is extremely general.
However, of those 120 I have seen about 76 species inclusive of both wild and captive animals. It's not an entirely precise number because of certain splits. Of those, 52 have been in the wild (two higher than on my actual life list, because of a couple of splits I don't follow).