APA (7th ed.) Citation

Johnson, G. L. (1974). The roles of the economist in studying problems involving energy and food. [publisher not identified].

Chicago Style (17th ed.) Citation

Johnson, Glenn Leroy. The Roles of the Economist in Studying Problems Involving Energy and Food. [U.S.]: [publisher not identified], 1974.

MLA (9th ed.) Citation

Johnson, Glenn Leroy. The Roles of the Economist in Studying Problems Involving Energy and Food. [publisher not identified], 1974.