APA (7th ed.) Citation
Elkington, J., Hailes, J., & Makower, J. (1990). The green consumer. Penguin Books.
Chicago Style (17th ed.) Citation
Elkington, John, Julia Hailes, and Joel Makower. The Green Consumer. New York, N.Y., U.S.A.: Penguin Books, 1990.
MLA (9th ed.) Citation
Elkington, John, et al. The Green Consumer. Penguin Books, 1990.
Warning: These citations may not always be 100% accurate.