APA استشهاد

Balakrishnan, M. (1988). Environmental issues: Problems and solutions.

استشهاد بنمط شيكاغو

Balakrishnan, M. Environmental Issues: Problems and Solutions. Golden Jubilee Publication, University of Kerala, 1988.

MLA استشهاد

Balakrishnan, M. Environmental Issues: Problems and Solutions. 1988.