U.S. Bureau of the Census. (1967). Pocket data book, U.S.A. U.S. Govt. Print. Off.].
Cita Chicago (17th ed.)U.S. Bureau of the Census. Pocket Data Book, U.S.A. [Washington: U.S. Govt. Print. Off.], 1967.
Cita MLA (9th ed.)U.S. Bureau of the Census. Pocket Data Book, U.S.A. U.S. Govt. Print. Off.], 1967.
Atenció: Aquestes cites poden no estar 100% correctes.