APA Edition Citation

singh Baldev, Balraj Bhattia, & G S Chhina. (1977). Selected topics in environmental biology. Oxford.

Chicago Edition Citation

singh Baldev, Balraj Bhattia, and G S Chhina. Selected Topics in Environmental Biology. Oxford, 1977.

MLA Edition Citation

singh Baldev, et al. Selected Topics in Environmental Biology. Oxford, 1977.