APA (7th ed.) Citation

Butler, P. (1961). An introduction to library science. University of Chicago Press.

Chicago Style (17th ed.) Citation

Butler, Pierce. An Introduction to Library Science. Chicago: University of Chicago Press, 1961.

MLA (9th ed.) Citation

Butler, Pierce. An Introduction to Library Science. University of Chicago Press, 1961.

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