Phelps, O. W. (1961). Rise of the labour movement in Jamaica. Institute of Industrial Relations.
Lua i Stíl Chicago (17ú heag.)Phelps, Orme Wheelock. Rise of the Labour Movement in Jamaica. Berkeley: Institute of Industrial Relations, 1961.
Lua MLA (8ú heag.)Phelps, Orme Wheelock. Rise of the Labour Movement in Jamaica. Institute of Industrial Relations, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.