Thai, Pham, Phan Ngoc, and Ha Huong. 2021. “The Studying the Biological Characteristics of the Stingless Bee Tetrigonilla Collina Smith 1857 (Apidae: Melipona) in Hanoi, Vietnam”. Vietnam Journal of Agricultural Sciences 4 (2), 1067-76. https://doi.org/10.31817/vjas.2021.4.2.07.