1. Devender, R. and Ramakrishna, H. (2015). Palynodiversity in Trigona honeys from Paderu Forest Division of Vishakhapatnam district, Andhra pradesh, India. Geophytology, 45 (2): 221-226.
2. Devender, R., Ramakrishna, H. and Padal, S.B. (2014a). Pollen Diversity of forest division (G madugula mandal paderu) Visakhapatnam District, Andhra pradesh. Adv. Appl. Res., 6: 1, 90-99. https://doi.org/10.5958/j.2349-2104.6.1.016
3. Devender, R., Ramakrishna, H. and Padal, S.B. (2014b). Pollen diversity in Apis honeys of Narsipatnam Forest, Visakhapatnam District, Andhra pradesh.Geophytology, 44 (2): 181-187.
4. Devender, R., Ramakrishna, H. Prabhakar, R. and Padal, S.B. (2013). Pollen Diversity of Some Medicinal Plants from Araku Valley, Visakhapatnam District, Andhra Pradesh. Advances in Plant Sci.26 (II) 457-462.
5. Erdtman, G. (1952). Pollen Morphology and Plant Taxonomy-Angiosperms (An Introduction to Palynology I), Almqvist & Wiksell. Stockholm. https://doi.org/10.1080/11035895209453507
6. Erdtman, G. (1960). The Acetolysis Method a revised description Svensk Botanisk Tidskrift, 54: 561-564. Saven.
7. Faegri, K. and Iversen, J. (1964).Textbook of Pollen Analysis, Hafner Pub. Co., NewYork.
8. FSI (2013). India State of Forest Report 2013.Forest Survey of India. Ministry of Environment & Forests. Dehra Dun.
9. Ganga Kailas, J. Ramakrishna, H. and Prabhakar, R. (2014). Palynodiversity of Arborescent Plants of Caesalpiniaceae Family of Karimnagar District, Telangana State, India. RJPBCS. 5(6): 349.
10. Pandey, R.P. and Diwakar, P.G. (2008).An integrated check-list flora of Andaman and Nicobar Islands, India. Journal of Economic Taxonomic Botany. 32: 403-500.
11. Prabhakar, R. and Ramakrishna, H. (2014).Palynodiversity in Boathmandal forest division of Adilabad district, Telangana State, India. Int. J. of Pharm. Life Sci. 5(7): 3685-3693.
12. Ramakrishna, H. and Bhushan, M. (2004). Diversity in pollen characterization of squeezed honey samples from Nizamabad district, Andhra Pradesh. Geophytology. 34 (1 & 2): 23-31.
13. Ramakrishna, H. and Bhushan, M. (2006). Nectar and pollen supply of rock bees (Apisdorsata) from Sadasianagar mandal of Nizamabad district, Andhra Pradesh. Geophytology, 36(1 & 2): 53-59.
14. Ramakrishna, H., Devender, R., Srinivasa Reddy and Ammani, K. (2012).Pollen Diversity at Gunadalakonda in Krishna District, Andhra Pradesh. Advances in Pollen Spore Research. XXX: 79-89.
15. Ramakrishna, H. and Swathi, S. (2013).Pollen diversity in Some Apisflorea honeys from Adilabad District, Andhra Pradesh, India. Geophytology. 42(1): 11-20.
16. Swathi, S. and Ramakrishna, H. (2013). Pollen Analysis of winter Honeys from the Dry Deciduous Forest of Adilabad District, Andhra Pradesh, India. Ad. Plant Sci. 26(II): 447-455.