Wallhead, C. M. (1974). Cultural contact in the Iberian Peninsula between Islam and Christianity, as reflected in speciman texts of early Castilian literature: Primera Cronica General, Calila E Dimna and EL Conde Lucanor. University of London.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Wallhead, Celia Margaret. Cultural Contact in the Iberian Peninsula Between Islam and Christianity, as Reflected in Speciman Texts of Early Castilian Literature: Primera Cronica General, Calila E Dimna and EL Conde Lucanor. London: University of London, 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Wallhead, Celia Margaret. Cultural Contact in the Iberian Peninsula Between Islam and Christianity, as Reflected in Speciman Texts of Early Castilian Literature: Primera Cronica General, Calila E Dimna and EL Conde Lucanor. University of London, 1974.