(2001). Vocational Education Directory, 1971 [United States] / United States Department of Education. National Center for Education Statistics. [electronic resource].
Citace podle Chicago (17th ed.)Vocational Education Directory, 1971 [United States] / United States Department of Education. National Center for Education Statistics. [electronic Resource]. 2001.
Citace podle MLA (9th ed.)Vocational Education Directory, 1971 [United States] / United States Department of Education. National Center for Education Statistics. [electronic Resource]. 2001.
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