Cita APA

ABBas S G, Singh B S, & M P Singh. (2005). Environment and natural resources (1.). Delhi.

Citación estilo Chicago

ABBas S G, Singh B S, and M P Singh. Environment and Natural Resources. 1. Delhi, 2005.

Cita MLA

ABBas S G, et al. Environment and Natural Resources. 1. Delhi, 2005.