Παραπομπή APA

Duggal, K. N. (1983). Elements of Public Health Engineering (3rd.). S. Chand & Co..

Παραπομπή Chicago Style

Duggal, K N. Elements of Public Health Engineering. 3rd. New Delhi: S. Chand & Co., 1983.

Παραπομπή MLA

Duggal, K N. Elements of Public Health Engineering. 3rd. S. Chand & Co., 1983.