Cita APA (7th ed.)
Sapp, J. (1999). What is natural?: Coral reef crisis. Oxford University Press.
Cita Chicago (17th ed.)
Sapp, Jan. What Is Natural?: Coral Reef Crisis. New York: Oxford University Press, 1999.
Cita MLA (9th ed.)
Sapp, Jan. What Is Natural?: Coral Reef Crisis. Oxford University Press, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.