Παραπομπή APA

Arvind Kumar, P. K. (2008). Environmental issues and solutions. Daya.

Παραπομπή Chicago Style

Arvind Kumar, Pashupati Kumar. Environmental Issues and Solutions. Delhi: Daya, 2008.

Παραπομπή MLA

Arvind Kumar, Pashupati Kumar. Environmental Issues and Solutions. Daya, 2008.