Cita APA (7th ed.)

Elkington, J., Hailes, J., & Makower, J. (1990). The green consumer. Penguin Books.

Cita Chicago (17th ed.)

Elkington, John, Julia Hailes, i Joel Makower. The Green Consumer. New York, N.Y., U.S.A.: Penguin Books, 1990.

Cita MLA (9th ed.)

Elkington, John, et al. The Green Consumer. Penguin Books, 1990.