Shqueir، A.، و Qabagah، R. (1999). Summary of a Study on Industrial Pollution of Quarries, Carpentry and Blacksmith Shops in Bethlehem District. مجلة جامعة بيت لحم، مج18 ، 94 - 96. مسترجع من http://search.mandumah.com/Record/1558189
Shqueir، Adnan، و Rafat Qabagah. "Summary of a Study On Industrial Pollution of Quarries, Carpentry and Blacksmith Shops in Bethlehem District." مجلة جامعة بيت لحم مج18 (1999): 94 - 96. مسترجع من http://search.mandumah.com/Record/1558189