APA (7th ed.) Citation

Downs, R. B., & Downs, E. C. (1966). How to do library research. University of Illinois Press.

Chicago Style (17th ed.) Citation

Downs, Robert B., and Elizabeth C. Downs. How to Do Library Research. Urbana: University of Illinois Press, 1966.

MLA (9th ed.) Citation

Downs, Robert B., and Elizabeth C. Downs. How to Do Library Research. University of Illinois Press, 1966.