APA (7th ed.) Citation

Ewer, D. W., & Hall, J. B. (1981). Ecological biology. Longman.

Chicago Style (17th ed.) Citation

Ewer, D. W., and J. B. Hall. Ecological Biology. Harlow: Longman, 1981.

MLA (9th ed.) Citation

Ewer, D. W., and J. B. Hall. Ecological Biology. Longman, 1981.