Style manual,
issued by the public printer under authority of section 51 of an act of Congress approved January 12, 1895.

APA Citation

United States. Government Printing Office. (1939). Style manual: issued by the public printer under authority of section 51 of an act of Congress approved January 12, 1895. Rev. ed. Washington.

MLA Citation

United States. Government Printing Office. Style Manual: Issued by the Public Printer Under Authority of Section 51 of an Act of Congress Approved January 12, 1895. Rev. ed. Washington, 1939.