APA (7th ed.) Citation

(1923). American library directory ... a classified list of libraries with names of librarians. R. R. Bowker.

Chicago Style (17th ed.) Citation

American Library Directory ... a Classified List of Libraries with Names of Librarians. New York: R. R. Bowker, 1923.

MLA (9th ed.) Citation

American Library Directory ... a Classified List of Libraries with Names of Librarians. R. R. Bowker, 1923.

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