APA (7th ed.) Citation

Butts, T. (1928). German exports and imports of sugar mill machinery. [publisher not identified].

Chicago Style (17th ed.) Citation

Butts, Thomas. German Exports and Imports of Sugar Mill Machinery. Washington, D.C.: [publisher not identified], 1928.

MLA (9th ed.) Citation

Butts, Thomas. German Exports and Imports of Sugar Mill Machinery. [publisher not identified], 1928.