APA

(1957). 1957 annual report. Washington, USA: U.S. Government Printing Office.

Chicago

1957. 1957 annual report. Washington, USA: U.S. Government Printing Office.

Harvard

(1957). 1957 annual report. Washington, USA: U.S. Government Printing Office.

MLA

1957 annual report. Washington, USA: U.S. Government Printing Office. 1957.