APA (7th ed.) Citation

Sumner, J. A. (1980). An introduction to heat pumps (2nd ed.). Prism Press.

Chicago Style (17th ed.) Citation

Sumner, John A. An Introduction to Heat Pumps. 2nd ed. Dorchester, Dorset: Prism Press, 1980.

MLA (9th ed.) Citation

Sumner, John A. An Introduction to Heat Pumps. 2nd ed. Prism Press, 1980.