Mornin' Dal. It's early Christmas mornng here in Pennsylvania, and I'm up well ahead of the family and the dog has already walked me, so I'll offer up what I know.
The top students of A-H aircraft are probably Peter Grosz and Dr. Martin O'Conner. Both have written encyclopedic single volume hardback editions on the topic, however, they are extremely expensive (read $100+ dollars---Amazon currently lists 4 copies of the Grosz volume starting at $849!!! . . . and I thought I paid a king's ransome for it a few years ago at $150!). The O'Conner book is long out of print and not easy to find, thus quite expensive. There are two better (more reasonably priced) options.
First, there are now two very good softcover Osprey titles in their Aircraft of the Aces series: "Austro-Hungarian Aces of World War 1" by Christopher Chant, and "Austro-Hungarian Albatros Aces of Word War 1" by Paolo Varriale, both of which are readily available from Amazon or Barnes & Noble on the web for under $20 US apiece. These cover only fighters.
Second, Dr. O'Conner wrote a 4-part series of articles on markings of all A-H aircraft in the Cross & Cockade Society journal years ago. I ordered these 4 issues directly from the C&C Society website. I think I ordered both download and CD, which cost more, I think about $48 US for all four. It's cheaper if you just order the download (which worked fine), but I don't trust this infernal machine, luddite that I am!

The bonus here is that you get some other interesting articles from the back issues along with Dr. O'Conner's articles. This is a very comprehensive set of materials, but no color profiles if I recall correctly (the Osprey volumes have great color profiles for the fighters). If you are interested, PM me and I'll dig out the citations or do what I can to assist you

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I hope this helps. Perhaps Steve has some additional (or better!) suggestions.
Merry Christmas!
Bob