Kassem، H. A.، Gad Allah، M. A. A.، Mostafa، M. H.، و Hafez، A. S. (1991). The Prevalence of Dental Caries Among Primary School Children in Relation to Fluoride Content of their Water Supply from Different Environment Sources (رسالة ماجستير غير منشورة). جامعة عين شمس، القاهرة. مسترجع من http://search.mandumah.com/Record/565843
Kassem، Hosni Ahmed، Mohsen Abd Alhamed Gad Allah، Mohamed Hosni Mostafa، و Ahmed Sherif Hafez. "The Prevalence of Dental Caries Among Primary School Children in Relation to Fluoride Content of Their Water Supply From Different Environment Sources" رسالة ماجستير. جامعة عين شمس، القاهرة، 1991. مسترجع من http://search.mandumah.com/Record/565843