Seland, Eivind Heldaas (1 december 2014). ”Early Christianity in East Africa and Red Sea/Indian Ocean Commerce” (på engelska). African Archaeological Review 31 (4): sid. 637–647. doi:10.1007/s10437-014-9172-5. ISSN1572-9842.
Seland, Eivind Heldaas (1 december 2014). ”Early Christianity in East Africa and Red Sea/Indian Ocean Commerce” (på engelska). African Archaeological Review 31 (4): sid. 637–647. doi:10.1007/s10437-014-9172-5. ISSN1572-9842.