Spellergerg, I. F., & Pritchard, A. J. (1984). Ecology, ecosystems, management and biology teaching. Division of Science, Technical and Vocational Education, UNESCO.
Chicago-referens (17:e uppl.)Spellergerg, Ian F., och Alan J. Pritchard. Ecology, Ecosystems, Management and Biology Teaching. Paris: Division of Science, Technical and Vocational Education, UNESCO, 1984.
MLA-referens (9:e uppl.)Spellergerg, Ian F., och Alan J. Pritchard. Ecology, Ecosystems, Management and Biology Teaching. Division of Science, Technical and Vocational Education, UNESCO, 1984.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.