APA (7th ed.) Citation

Watt, S. B., & Collett, J. (1976). 21 chain and washer pumps: From the 1958 Peking Agricultural Exhibition. Intermediate Technology Publications Ltd.

Chicago Style (17th ed.) Citation

Watt, S. B., and John Collett. 21 Chain and Washer Pumps: From the 1958 Peking Agricultural Exhibition. London: Intermediate Technology Publications Ltd, 1976.

MLA (9th ed.) Citation

Watt, S. B., and John Collett. 21 Chain and Washer Pumps: From the 1958 Peking Agricultural Exhibition. Intermediate Technology Publications Ltd, 1976.