APA (7th ed.) Citation

Gaskin, D. E. (1982). The ecology of whales and dolphins. Heinemann Educational Books.

Chicago Style (17th ed.) Citation

Gaskin, D. E. The Ecology of Whales and Dolphins. London Exeter, N.H: Heinemann Educational Books, 1982.

MLA (9th ed.) Citation

Gaskin, D. E. The Ecology of Whales and Dolphins. Heinemann Educational Books, 1982.