1. Abak, K. A. Z. I. M., Dasgan, H. Y., Ikiz, Ö., Uygun, N., Sayalan, M., Kaftanoglu, O., & Yeninar, H. A. L. İ. L. (1997). Pollen production and quality of pepper grown in unheated greenhouses during winter and the effects of bumblebees (Bombus terrestris) pollination on fruit yield and quality. Acta Horticulturae., 437, 303–307.
2. Abrol, D. P. (1991). Conservation of pollinators for promotion of agricultural production in India. Journal of Animal Morphology and Physiology., 38, 123.
3. Abrol, D. P. (2012). Pollination biology: biodiversity conservation and agricultural production (p. 823). Springer.
4. Albano, S., Salvado, E., Duarte, S., Mexia, A., & Borges, P. A. (2009). Pollination effectiveness of different strawberry floral visitors in Ribatejo, Portugal: selection of potential pollinators. Part 2. Advances in Horticultural Science, 246–253.
5. Amla, U., & Shivalingaswamy, T. M. (2017). Role of native buzz pollinator bees in enhancing fruit and seed set in tomatoes under open field conditions. Journal of Entomology and Zoology Studies, 5(3), 1742–1744.