APA (7th ed.) Citation

Purves, W. F. (1978). Pumps for oil spill cleanup. [publisher not identified].

Chicago Style (17th ed.) Citation

Purves, W. F. Pumps for Oil Spill Cleanup. [Ottawa?]: [publisher not identified], 1978.

MLA (9th ed.) Citation

Purves, W. F. Pumps for Oil Spill Cleanup. [publisher not identified], 1978.

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