APA (7th ed.) Citation

Sumner, J. A. (1976). An introduction to heat pumps / by John A. Sumner. Prism Press.

Chicago Style (17th ed.) Citation

Sumner, John A. An Introduction to Heat Pumps / by John A. Sumner. Dorchester, Dorset: Prism Press, 1976.

MLA (9th ed.) Citation

Sumner, John A. An Introduction to Heat Pumps / by John A. Sumner. Prism Press, 1976.

Warning: These citations may not always be 100% accurate.