Echu, G., & Obeng, S. G. (2004). Africa meets Europe: Language contact in West Africa. Nova Science Publ..
Lua i Stíl Chicago (17ú heag.)Echu, George, agus Samuel Gyasi Obeng. Africa Meets Europe: Language Contact in West Africa. New York: Nova Science Publ., 2004.
Lua MLA (8ú heag.)Echu, George, agus Samuel Gyasi Obeng. Africa Meets Europe: Language Contact in West Africa. Nova Science Publ., 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.