Cita APA (7th ed.)
Chouhan,B.S. Environmental studies / Chouhan,B.S: University Science Press.
Cita Chicago (17th ed.)
Chouhan,B.S. Environmental Studies / Chouhan,B.S: University Science Press.
Cita MLA (9th ed.)
Chouhan,B.S. Environmental Studies / Chouhan,B.S: University Science Press.
Atenció: Aquestes cites poden no estar 100% correctes.