APA

United States, . (1978). Recommended dietary allowances: more research and better food guides needed. [Washington, D.C: .

Chicago

United States, . 1978. Recommended dietary allowances: more research and better food guides needed. [Washington, D.C: .

Harvard

United States, . (1978). Recommended dietary allowances: more research and better food guides needed. [Washington, D.C: .

MLA

United States, . Recommended dietary allowances: more research and better food guides needed. [Washington, D.C: . 1978.