Studies in North-East Africa (Egypt, Sudan, Yemen) / [prepared by Karel Petráček and Oldřich Král]. — Praha : Universita Karlova, 1967. — 135, [1] с. — (Acta Universitatis Carolinae. Philologica ; 4, 1967. Orientalia Pragensia ; 5) - Petráček, Karel; Král, Oldřich (Acta Universitatis Carolinae, 1967)