Zullkiflee, N., Taha, H., Abdullah, N. A., Hashim, F., & Usman, A. Antibacterial and antioxidant activities of ethanolic and water extracts of stingless bees Tetrigona binghami, Heterotrigona itama, and Geniotrigona thoracica propolis found in Brunei. Philippine Journal of Science.

Zullkiflee, Nadzirah, Hussein Taha, Nurul Aliah Abdullah, Fatimah Hashim, and Anwar Usman. "Antibacterial and Antioxidant Activities of Ethanolic and Water Extracts of Stingless Bees Tetrigona Binghami, Heterotrigona Itama, and Geniotrigona Thoracica Propolis Found in Brunei." Philippine Journal of Science .

Zullkiflee, Nadzirah, et al. "Antibacterial and Antioxidant Activities of Ethanolic and Water Extracts of Stingless Bees Tetrigona Binghami, Heterotrigona Itama, and Geniotrigona Thoracica Propolis Found in Brunei." Philippine Journal of Science, .