Friedland, w. H. (1969). Vuta kamba: The development of trade unions in tangayika. hoover institution.
Lua i Stíl Chicago (17ú heag.)Friedland, william H. Vuta Kamba: The Development of Trade Unions in Tangayika. California: hoover institution, 1969.
Lua MLA (9ú heag.)Friedland, william H. Vuta Kamba: The Development of Trade Unions in Tangayika. hoover institution, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.