Gyasi Obeng, S. West African Languages in Contact with European Languages: Samuel Gyasi Obeng. Africa meets Europe : language contact in West Africa.(2004).
Lua i Stíl Chicago (17ú heag.)Gyasi Obeng, Samuel. "West African Languages in Contact with European Languages: Samuel Gyasi Obeng." Africa Meets Europe : Language Contact in West Africa.(2004) .
Lua MLA (8ú heag.)Gyasi Obeng, Samuel. "West African Languages in Contact with European Languages: Samuel Gyasi Obeng." Africa Meets Europe : Language Contact in West Africa.(2004), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.