APA (7th ed.) Citation

Robertson, J., & Lewallen, J. (1975). The Grass roots primer. Sierra Club Books.

Chicago Style (17th ed.) Citation

Robertson, James, and John Lewallen. The Grass Roots Primer. San Francisco: Sierra Club Books, 1975.

MLA (9th ed.) Citation

Robertson, James, and John Lewallen. The Grass Roots Primer. Sierra Club Books, 1975.