Library of Congress. General Reference and Bibliography Division & Orr, O. H. (1976). A guide to the study of the United States of America: Representative books reflecting the development of American life and thought, supplement 1956-1965. Library of Congress : for sale by the Supt. of Docs., U.S. Govt. Print. Off..
Παραπομπή σε μορφή Chicago (17η εκδ.)Library of Congress. General Reference and Bibliography Division και Oliver H. Orr. A Guide to the Study of the United States of America: Representative Books Reflecting the Development of American Life and Thought, Supplement 1956-1965. Washington: Library of Congress : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976.
Παραπομπή σε μορφή MLA (8th εκδ.)Library of Congress. General Reference and Bibliography Division και Oliver H. Orr. A Guide to the Study of the United States of America: Representative Books Reflecting the Development of American Life and Thought, Supplement 1956-1965. Library of Congress : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976.