Westerman, M. (1993). Easy green: A handbook of earth-smart activities and operating procedures for youth programs. American Camping Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Westerman, Marty. Easy Green: A Handbook of Earth-smart Activities and Operating Procedures for Youth Programs. London: American Camping Association, 1993.
Παραπομπή σε μορφή MLA (9th εκδ.)Westerman, Marty. Easy Green: A Handbook of Earth-smart Activities and Operating Procedures for Youth Programs. American Camping Association, 1993.
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