APA (7th ed.) Citation

Van Matre, S., & Johnson, B. (1987). Earthkeepers: Four keys for helping young people live in harmony with the earth. Institute for Earth Education.

Chicago Style (17th ed.) Citation

Van Matre, Steve, and Bruce Johnson. Earthkeepers: Four Keys for Helping Young People Live in Harmony with the Earth. [Warrenville, Ill.]: Institute for Earth Education, 1987.

MLA (8th ed.) Citation

Van Matre, Steve, and Bruce Johnson. Earthkeepers: Four Keys for Helping Young People Live in Harmony with the Earth. Institute for Earth Education, 1987.