APA (7th ed.) Citation

(1981). Worldmark encyclopedia of the States: A practical guide to the geographic, demographic, historical, political, economic, and social development of the United States. Worldmark Press ; Harper & Row [distributor].

Chicago Style (17th ed.) Citation

Worldmark Encyclopedia of the States: A Practical Guide to the Geographic, Demographic, Historical, Political, Economic, and Social Development of the United States. [England?] : New York: Worldmark Press ; Harper & Row [distributor], 1981.

MLA (9th ed.) Citation

Worldmark Encyclopedia of the States: A Practical Guide to the Geographic, Demographic, Historical, Political, Economic, and Social Development of the United States. Worldmark Press ; Harper & Row [distributor], 1981.