Maher Ishak, E. (1976). The phonetics and phonology of the Boḥairic dialect of Coptic and the survival of Coptic words in the colloquial and classical Arabic of Egypt and of Coptic grammatical constructions in colloquial Egyptian Arabic. University of Oxford.

Maher Ishak, Emile. The Phonetics and Phonology of the Boḥairic Dialect of Coptic and the Survival of Coptic Words in the Colloquial and Classical Arabic of Egypt and of Coptic Grammatical Constructions in Colloquial Egyptian Arabic. England: University of Oxford, 1976.

Maher Ishak, Emile. The Phonetics and Phonology of the Boḥairic Dialect of Coptic and the Survival of Coptic Words in the Colloquial and Classical Arabic of Egypt and of Coptic Grammatical Constructions in Colloquial Egyptian Arabic. University of Oxford, 1976.