Παραπομπή APA

Balakrishnan, M., & Alexander, K. M. (1988). Environmental issues: Problems and solutions. University of Kerala.

Παραπομπή Chicago Style

Balakrishnan, M., και K. M. Alexander. Environmental Issues: Problems and Solutions. Thiruvananthapuram: University of Kerala, 1988.

Παραπομπή MLA

Balakrishnan, M., και K. M. Alexander. Environmental Issues: Problems and Solutions. University of Kerala, 1988.