APA (7th ed.) Citation

Butler, H. D. (1925). Depressed foreign market for British pumps. [publisher not identified].

Chicago Style (17th ed.) Citation

Butler, Hugh D. Depressed Foreign Market for British Pumps. Washington, D.C.: [publisher not identified], 1925.

MLA (9th ed.) Citation

Butler, Hugh D. Depressed Foreign Market for British Pumps. [publisher not identified], 1925.