Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.