Sengar, R., & Kumar, A. (2017). Environment science question bank: A handbook for competitive examinations. CBS Publishers.
استشهاد بنمط شيكاغوSengar, R.S, و Amit Kumar. Environment Science Question Bank: A Handbook for Competitive Examinations. New Delhi: CBS Publishers, 2017.
MLA استشهادSengar, R.S, و Amit Kumar. Environment Science Question Bank: A Handbook for Competitive Examinations. CBS Publishers, 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.