Cita APA (7th ed.)

Raj , G. (1997). Encyclopaedia of environmental sciences. Akashdeep.

Cita Chicago (17th ed.)

Raj , Gurdeep. Encyclopaedia of Environmental Sciences. New Delhi: Akashdeep, 1997.

Cita MLA (9th ed.)

Raj , Gurdeep. Encyclopaedia of Environmental Sciences. Akashdeep, 1997.