Gyasi Obeng, S. West African Languages in Contact with European Languages: Samuel Gyasi Obeng. Africa meets Europe : language contact in West Africa.(2004).
Čikaški stil citiranja (17. izdanje)Gyasi Obeng, Samuel. "West African Languages in Contact with European Languages: Samuel Gyasi Obeng." Africa Meets Europe : Language Contact in West Africa.(2004) .
MLA način citiranja (8. izdanje)Gyasi Obeng, Samuel. "West African Languages in Contact with European Languages: Samuel Gyasi Obeng." Africa Meets Europe : Language Contact in West Africa.(2004), .
Upozorenje: Ovi citati možda nisu uvijek 100% točni.