Nelson, W. H., & Loewenheim, F. L. (1967). Theory and practice in American politics: Editors: W.H.Nelson and F.L.Loewenheim. Chic. U.P..
Lua i Stíl Chicago (17ú heag.)Nelson, William H., agus Francis L. Loewenheim. Theory and Practice in American Politics: Editors: W.H.Nelson and F.L.Loewenheim. Chic.: Chic. U.P., 1967.
Lua MLA (8ú heag.)Nelson, William H., agus Francis L. Loewenheim. Theory and Practice in American Politics: Editors: W.H.Nelson and F.L.Loewenheim. Chic. U.P., 1967.
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