APA

United States, . (1966). Your child from six to twelve. Washington, D. C: U.S. Govt. Printing Office.

Chicago

United States, . 1966. Your child from six to twelve. Washington, D. C: U.S. Govt. Printing Office.

Harvard

United States, . (1966). Your child from six to twelve. Washington, D. C: U.S. Govt. Printing Office.

MLA

United States, . Your child from six to twelve. Washington, D. C: U.S. Govt. Printing Office. 1966.