APA (7th ed.) Citation

Sommer, H. H. (1951). The theory and practice of ice cream making (6th ed.). [publisher not identified].

Chicago Style (17th ed.) Citation

Sommer, Hugo Henry. The Theory and Practice of Ice Cream Making. 6th ed. Madison, Wis.: [publisher not identified], 1951.

MLA (9th ed.) Citation

Sommer, Hugo Henry. The Theory and Practice of Ice Cream Making. 6th ed. [publisher not identified], 1951.