Lunar Mansions: which ones?
There are actually at least three systems of lunar mansions:
1) the Vedic ones, also known as Nakshatras. A good reference for these is:
Harness, Dennis. 1999. The Nakshatras: The Lunar Mansions of Vedic Astrology. Lotus Press: Twin Lakes, WI.
2) The Western ones. Chris Warnock's page listed above is a good source. Most likely, the Western ones were a transmission of the Vedic ones. However, the technique never really caught on, probably in great part because, while Hellenistic astrology had a strong lunar basis, this quality was scaled back in Arabic and then medival Latin astrology.
3) the Chinese ones. Here, you can find out some information in:
Walters, Derek. 2005. The Complete Guide to Chinese Astrology : The Most Comprehensive Study of the Subject Ever Published in the English Language. Watkins/Duncan Baird: London.