Das Mashafa Milad (Liber Nativitatis) und Mashafa Sellase (Liber Trinitatis) Des Kaisers Zar'a Ya'qob - Zarʼā Yā‘qōb, <re d'Etiopia>. (OLS)http://semarc/name/116103; Wendt, Kurt. (OLS)http://semarc/name/10002 (CorpusSCO,, 1962)