Urrutia, M. (1969). The development of the Colombian labor movement. Yale University Press.
Lua i Stíl Chicago (17ú heag.)Urrutia, Miguel. The Development of the Colombian Labor Movement. New Haven: Yale University Press, 1969.
Lua MLA (9ú heag.)Urrutia, Miguel. The Development of the Colombian Labor Movement. Yale University Press, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.