APA (7th ed.) Citation

Butler, H. D. (1926). Increased importance of British electrical exports. [publisher not identified].

Chicago Style (17th ed.) Citation

Butler, Hugh D. Increased Importance of British Electrical Exports. Washington, D.C.: [publisher not identified], 1926.

MLA (9th ed.) Citation

Butler, Hugh D. Increased Importance of British Electrical Exports. [publisher not identified], 1926.