APA (7th ed.) Citation

Sheals, J. G. (1969). The soil ecosystem: Systematic aspects of the environment, organisms and communities : a symposium. Systematics Association.

Chicago Style (17th ed.) Citation

Sheals, John Gordon. The Soil Ecosystem: Systematic Aspects of the Environment, Organisms and Communities : A Symposium. London: Systematics Association, 1969.

MLA (9th ed.) Citation

Sheals, John Gordon. The Soil Ecosystem: Systematic Aspects of the Environment, Organisms and Communities : A Symposium. Systematics Association, 1969.