APA (7th ed.) Citation

Barrett, K., & Willard, C. (1998). Schoolyard ecology: Teacher's guide. Lawrence Hall of Science, University of California.

Chicago Style (17th ed.) Citation

Barrett, Katharine, and Carolyn Willard. Schoolyard Ecology: Teacher's Guide. Berkeley, CA: Lawrence Hall of Science, University of California, 1998.

MLA (9th ed.) Citation

Barrett, Katharine, and Carolyn Willard. Schoolyard Ecology: Teacher's Guide. Lawrence Hall of Science, University of California, 1998.