AI Shalan، T. A. A.، و Erickson، P. (1999). Genetic variations of Mutans Streptococci Isolated from Children with and without Early Childhood Caries (رسالة دكتوراه غير منشورة). University of Minnesota، مينيسوتا. مسترجع من http://search.mandumah.com/Record/620568
AI Shalan، Thakib Abd Alrahman، و Pamela Erickson. "Genetic Variations of Mutans Streptococci Isolated From Children With and Without Early Childhood Caries" رسالة دكتوراه. University of Minnesota، مينيسوتا، 1999. مسترجع من http://search.mandumah.com/Record/620568