Cita APA (7th ed.)

Spellergerg, I. F., & Pritchard, A. J. (1984). Ecology, ecosystems, management and biology teaching. Division of Science, Technical and Vocational Education, UNESCO.

Cita Chicago (17th ed.)

Spellergerg, Ian F., i Alan J. Pritchard. Ecology, Ecosystems, Management and Biology Teaching. Paris: Division of Science, Technical and Vocational Education, UNESCO, 1984.

Cita MLA (9th ed.)

Spellergerg, Ian F., i Alan J. Pritchard. Ecology, Ecosystems, Management and Biology Teaching. Division of Science, Technical and Vocational Education, UNESCO, 1984.