Chatterjee, R., S. Sarkar, and G. M. N. Rao. “Pollen Morphology and Palynotaxonomical Studies of Common Garden Plants of Apocynaceae, In Kolkata, West Bengal, India”. International Journal of Environment, vol. 3, no. 4, Dec. 2014, pp. 109-16, doi:10.3126/ije.v3i4.11735.