APA (7th ed.) Citation

Pepper, D., Youngs, M., & Perkins , J. (1984). The roots of modern environmentalism with material. Routledge.

Chicago Style (17th ed.) Citation

Pepper, David, Martyn Youngs, and John Perkins. The Roots of Modern Environmentalism with Material. London: Routledge, 1984.

MLA (9th ed.) Citation

Pepper, David, et al. The Roots of Modern Environmentalism with Material. Routledge, 1984.