APA (7th ed.) Citation

Hall, J. L., & Brown, M. J. (1981). Online bibliographic databases. An international directory (2nd ed.). Aslib.

Chicago Style (17th ed.) Citation

Hall, James L., and Majorie J. Brown. Online Bibliographic Databases. An International Directory. 2nd ed. London: Aslib, 1981.

MLA (9th ed.) Citation

Hall, James L., and Majorie J. Brown. Online Bibliographic Databases. An International Directory. 2nd ed. Aslib, 1981.