Here a few books that are interesting and useful for learning about stingless bees:
These 2 books are by experienced leaders in the Australian Native stingless Bee community
they can be ordered from Richard & Janine Zabel directly Click Here
Pot-Honey: A legacy of stingless bees
By Patricia Vit (Editor), Silvia R. M. Pedro (Editor), David Roubik (Editor)
Beescape for Meliponines: Conservation of Indo-Malayan Stingless Bees
By Abu Hassan Jalil (Author)
The Bees of the World 2nd Edition
by Charles D. Michener (Author)
Bee Pollination in Agricultural Ecosystems
by Rosalind James (Editor), Theresa L. Pitts-Singer (Editor)
By Wayne Weiseman (Author), Daniel Halsey (Author), Bryce Ruddock (Author)