APA (7th ed.) Citation

Hukill, G. R., & Lyon, C. E. (1928). Typewriters in Switzerland. [publisher not identified].

Chicago Style (17th ed.) Citation

Hukill, George R., and Charles E. Lyon. Typewriters in Switzerland. Washington, D.C.: [publisher not identified], 1928.

MLA (9th ed.) Citation

Hukill, George R., and Charles E. Lyon. Typewriters in Switzerland. [publisher not identified], 1928.