APA (7th ed.) Citation

Sewell, P. H. (1956). The Regional library systems (2nd ed., rev.). Library Association.

Chicago Style (17th ed.) Citation

Sewell, Philip Hooper. The Regional Library Systems. 2nd ed., rev. London: Library Association, 1956.

MLA (9th ed.) Citation

Sewell, Philip Hooper. The Regional Library Systems. 2nd ed., rev. Library Association, 1956.