1. Abrol, D. P. (1997). Bees and beekeeping in India (p. 450). Ludhiana: Kalyani Publishers.
2. Akratanakul, P. (1976). Honey bees in Thailand. American Bee Journal, 116(120–121), 124–126.
3. Akratanakul, P. (1977). The natural history of the dwarf honey bee, Apis florea F. in Thailand. Thesis, Cornell University, Ithaca.
4. Alexander, B. A. (1991a). A cladistic analysis of the genus Apis. In D. R. Smith (Ed.), Diversity in the genus Apis (pp. 1–28). Boulder: Westview.
5. Alexander, B. A. (1991b). Phylogenetic analysis of the genus Apis (Hymenoptera: Apidae). Annals of the Entomological Society of America, 84, 137–149.