“Distribution and Morphometrical Variations of Stingless Bees (Apidae: Meliponini) In Urban and Forest Areas of Penang Island, Malaysia”. Journal of Tropical Resources and Sustainable Science (JTRSS) , vol. 4, no. 1, Dec. 2016, pp. 1-5, https://doi.org/10.47253/jtrss.v4i1.586.