Elkington, J., Hailes, J., & Makower, J. (1990). The green consumer. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Elkington, John, Julia Hailes, agus Joel Makower. The Green Consumer. New York, N.Y., U.S.A.: Penguin Books, 1990.
Lua MLA (9ú heag.)Elkington, John, et al. The Green Consumer. Penguin Books, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.