Παραπομπή APA

Sarkar,, A. (1997). Practical geography: A systematic approach. Orient Longman.

Παραπομπή Chicago Style

Sarkar,, Ashis. Practical Geography: A Systematic Approach. New Delhi: Orient Longman, 1997.

Παραπομπή MLA

Sarkar,, Ashis. Practical Geography: A Systematic Approach. Orient Longman, 1997.