Grambs, J. D. (1960). Understanding inter-group relations. National Education Association of the United States.
Lua i Stíl Chicago (17ú heag.)Grambs, Jean Dresden. Understanding Inter-group Relations. Washington, D.C: National Education Association of the United States, 1960.
Lua MLA (9ú heag.)Grambs, Jean Dresden. Understanding Inter-group Relations. National Education Association of the United States, 1960.
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