Perbi ne nhoma ɛde A History of Indigenous Slavery in Ghana from the 15th to the 19th Century no kyerewfo na wakyerɛw nhoma ahorɔw beye 20. Perbi yɛ Ghana ananmusifo wɔ adwumakuo a ede UNESCO International Scientific and Technical Committee on the Slave Route Project. ɔsan nso ye ɔmanfotufo ne  sika ho ntotoe so hwɛfo wɔ adwumakuo a ɛde the Historical Society of Ghana.