Ochała, G. (2011). Chronological systems of Christian Nubia: By Grzegorz Ochała (Wyd. 1.). Warsaw: University of Warsaw, Faculty of Law and Administration, Chair of Roman and Antique Law : University of Warsaw, Institute of Archaeology, Department of Papyrology : The Raphael Taubenschlag Foundation.
استشهاد بنمط شيكاغوOchała, Grzegorz. Chronological Systems of Christian Nubia: By Grzegorz Ochała. Wyd. 1. Warsaw: University of Warsaw, Faculty of Law and Administration, Chair of Roman and Antique Law : University of Warsaw, Institute of Archaeology, Department of Papyrology : The Raphael Taubenschlag Foundation, 2011.
MLA استشهادOchała, Grzegorz. Chronological Systems of Christian Nubia: By Grzegorz Ochała. Wyd. 1. Warsaw: University of Warsaw, Faculty of Law and Administration, Chair of Roman and Antique Law : University of Warsaw, Institute of Archaeology, Department of Papyrology : The Raphael Taubenschlag Foundation, 2011.