Cita APA (7th ed.)

Merrick, W., & O' Sullivan, J. (1990). The environment. Oxford University Press.

Cita Chicago (17th ed.)

Merrick, William, i Joan O' Sullivan. The Environment. Oxford: Oxford University Press, 1990.

Cita MLA (9th ed.)

Merrick, William, i Joan O' Sullivan. The Environment. Oxford University Press, 1990.