Παραπομπή APA

Singh,R.P, & Zubairul Islam. (2012). Environmental studies. Concept Publishing Co.Pvt Ltd.

Παραπομπή Chicago Style

Singh,R.P, και Zubairul Islam. Environmental Studies. New Delhi: Concept Publishing Co.Pvt Ltd, 2012.

Παραπομπή MLA

Singh,R.P, και Zubairul Islam. Environmental Studies. Concept Publishing Co.Pvt Ltd, 2012.