APA
Singh R., . (1961). Role of blue green algae in nitrogen economy of Indian agriculture. New Delhi: Indian Council for Agricultural Research.
Chicago
Singh R.N, . 1961. Role of blue green algae in nitrogen economy of Indian agriculture. New Delhi: Indian Council for Agricultural Research.
Harvard
Singh R., . (1961). Role of blue green algae in nitrogen economy of Indian agriculture. New Delhi: Indian Council for Agricultural Research.
MLA
Singh R.N, . Role of blue green algae in nitrogen economy of Indian agriculture. New Delhi: Indian Council for Agricultural Research. 1961.