Friedland, w. H. (1969). Vuta kamba: The development of trade unions in tangayika. hoover institution.
Chicago-čujuhus (17. p.)Friedland, william H. Vuta Kamba: The Development of Trade Unions in Tangayika. California: hoover institution, 1969.
MLA-čujuhus (9. p.)Friedland, william H. Vuta Kamba: The Development of Trade Unions in Tangayika. hoover institution, 1969.
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