Saleh، F. A.، و Nwanko، R. N. (1993). Communication Patterns of Yemeni Immigrants in the United States: A Survey of an Immigrant Community in the Process of Acculturation (رسالة دكتوراه غير منشورة). Howard University، واشنطن. مسترجع من http://search.mandumah.com/Record/616330
Saleh، Faisal Ahmed، و Robert Nwafo Nwanko. "Communication Patterns of Yemeni Immigrants in the United States: A Survey of an Immigrant Community in the Process of Acculturation" رسالة دكتوراه. Howard University، واشنطن، 1993. مسترجع من http://search.mandumah.com/Record/616330