Παραπομπή APA

SINGH M.K. (1989). ENVIRONMENTAL CHANGES AND DEVELOPMENT. CHUGH PUBLICATIONS.

Παραπομπή Chicago Style

SINGH M.K. ENVIRONMENTAL CHANGES AND DEVELOPMENT. ALLAHABAD: CHUGH PUBLICATIONS, 1989.

Παραπομπή MLA

SINGH M.K. ENVIRONMENTAL CHANGES AND DEVELOPMENT. CHUGH PUBLICATIONS, 1989.