Sterling, S. R. (1980). Environmental education in theory and practice: An annotated bibliography. Council for Environmental Education.
Chicago-Zitierstil (17. Ausg.)Sterling, S. R. Environmental Education in Theory and Practice: An Annotated Bibliography. Reading: Council for Environmental Education, 1980.
MLA-Zitierstil (9. Ausg.)Sterling, S. R. Environmental Education in Theory and Practice: An Annotated Bibliography. Council for Environmental Education, 1980.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.