APA (7th ed.) Citation

York, H. E. (1990). Political science: A guide to reference and information sources. Libraries Unlimited.

Chicago Style (17th ed.) Citation

York, Henry E. Political Science: A Guide to Reference and Information Sources. Englewood, Colo: Libraries Unlimited, 1990.

MLA (9th ed.) Citation

York, Henry E. Political Science: A Guide to Reference and Information Sources. Libraries Unlimited, 1990.