APA (7th ed.) Citation

Sorensen, H. C. (1925). Danish refrigerating machinery industry. [publisher not identified].

Chicago Style (17th ed.) Citation

Sorensen, Harry C. Danish Refrigerating Machinery Industry. Washington, D.C.: [publisher not identified], 1925.

MLA (9th ed.) Citation

Sorensen, Harry C. Danish Refrigerating Machinery Industry. [publisher not identified], 1925.