APA (7th ed.) Citation

Sorensen, H. C. (1927). World trade in coal tar dyes, food coloring: Denmark. [publisher not identified].

Chicago Style (17th ed.) Citation

Sorensen, Harry C. World Trade in Coal Tar Dyes, Food Coloring: Denmark. Washington, D.C.: [publisher not identified], 1927.

MLA (9th ed.) Citation

Sorensen, Harry C. World Trade in Coal Tar Dyes, Food Coloring: Denmark. [publisher not identified], 1927.