APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

Warning: These citations may not always be 100% accurate.