Morehead, J. (1999). Introduction to United States government information sources (6th ed.). Libraries Unlimited.
Citace podle Chicago (17th ed.)Morehead, Joe. Introduction to United States Government Information Sources. 6th ed. Englewood, Colo: Libraries Unlimited, 1999.
Citace podle MLA (9th ed.)Morehead, Joe. Introduction to United States Government Information Sources. 6th ed. Libraries Unlimited, 1999.
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