Principles and methods in typewriting

MLA

Webb, Robert Franklin. Principles and methods in typewriting. New York : Prentice-Hall, inc., [1931.]

APA

Webb, R. (1931). Principles and methods in typewriting. New York : Prentice-Hall, inc..

Chicago

Webb, Robert Franklin. Principles and methods in typewriting. New York : Prentice-Hall, inc., [1931.]