There are a great number of books on Perfins. Most countries are represented in their own books, usually written by some specialty stamp group in the particular country. Here in the US, we have a Very good group ... The Perfins Club ..
link ....
http://www.perfins.org ..... You will be able to get info on the club, and a brief overview of perfin articles there.
The US book on Perfins is a massive undertaking: Catalog of United States Perfins, 1998. The price is pretty high but for a 2 1/4 inch thick book, but it doesn't get much better. The prices I think are on the website.
As mentioned elsewhere on this group, I am a member of the Perfins Club, have been for almost 40 years, and find the club very useful when it comes to US Perfins (as well as foreign material). I think the dues ar $15 per year, but that gets you 6 issues of the clubs publication, access to sales circuits, access to discounted books, and so on.
I do not know of any single publication that deals with worlwide perfins, so
can't help you there. If I can be of any other help, email me off group and I will see what I can do to help.