APA (7th ed.) Citation

H.W. Wilson Company. Vertical file index. H.W. Wilson.

Chicago Style (17th ed.) Citation

H.W. Wilson Company. Vertical File Index. New York: H.W. Wilson.

MLA (9th ed.) Citation

H.W. Wilson Company. Vertical File Index. H.W. Wilson.

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