Παραπομπή APA

Roy, . M. M. (1977). Principles of soil science. Mac Millan Company of India Ltd.

Παραπομπή Chicago Style

Roy, M M. Principles of Soil Science. New Delhi: Mac Millan Company of India Ltd, 1977.

Παραπομπή MLA

Roy, M M. Principles of Soil Science. Mac Millan Company of India Ltd, 1977.