Παραπομπή APA

Verma R. K. & Verma, G. (1989). Research methodology. Common Wealth Publishers.

Παραπομπή Chicago Style

Verma R. K. και Gopal Verma. Research Methodology. New Delhi: Common Wealth Publishers, 1989.

Παραπομπή MLA

Verma R. K. και Gopal Verma. Research Methodology. Common Wealth Publishers, 1989.