APA-referens (7:e uppl.)

Horn, R. E., & Shafer, R. E. (1967). Language change and communication. Science Research Associates.

Chicago-referens (17:e uppl.)

Horn, Robert E., och Robert Eugene Shafer. Language Change and Communication. Chicago: Science Research Associates, 1967.

MLA-referens (8:e uppl.)

Horn, Robert E., och Robert Eugene Shafer. Language Change and Communication. Science Research Associates, 1967.