Friedland, w. H. (1969). Vuta kamba: The development of trade unions in tangayika. hoover institution.
Tohutoru Kātū Chicago (17th ed.)Friedland, william H. Vuta Kamba: The Development of Trade Unions in Tangayika. California: hoover institution, 1969.
Tohutoro MLA (9th ed.)Friedland, william H. Vuta Kamba: The Development of Trade Unions in Tangayika. hoover institution, 1969.
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