APA (7th ed.) Citation

Christian, E. B. (1931). Market for typewriters in Sweden. [publisher not identified].

Chicago Style (17th ed.) Citation

Christian, Early B. Market for Typewriters in Sweden. Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Christian, Early B. Market for Typewriters in Sweden. [publisher not identified], 1931.