Παραπομπή APA

Parminder Singh. (2014). Environmental problems: A global health hazards. Cyber tech publications.

Παραπομπή Chicago Style

Parminder Singh. Environmental Problems: A Global Health Hazards. New Delhi: Cyber tech publications, 2014.

Παραπομπή MLA

Parminder Singh. Environmental Problems: A Global Health Hazards. Cyber tech publications, 2014.