Cita APA (7th ed.)
Nebel, B. (1996). Environmental science (5th.). Prentice Hall.
Cita Chicago (17th ed.)
Nebel, Bernard. Environmental Science. 5th. New Jersey: Prentice Hall, 1996.
Cita MLA (9th ed.)
Nebel, Bernard. Environmental Science. 5th. Prentice Hall, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.