Wurfel, S. W. 1. (1965). Foreign enterprise in Colombia: Laws and policies. University of North Carolina Press.
Lua i Stíl Chicago (17ú heag.)Wurfel, Seymour W. 1907. Foreign Enterprise in Colombia: Laws and Policies. Chapel Hill: University of North Carolina Press, 1965.
Lua MLA (9ú heag.)Wurfel, Seymour W. 1907. Foreign Enterprise in Colombia: Laws and Policies. University of North Carolina Press, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.