Abu Ata, B. M. H. (2001). An arabic stemming algorithm based on extensive rules application (ERA) for information retrieval: Its development and performance measures. Fakulti Teknologi dan Sains Maklumat, Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Abu Ata, Belal Mustafa Husein. An Arabic Stemming Algorithm Based on Extensive Rules Application (ERA) for Information Retrieval: Its Development and Performance Measures. Bangi: Fakulti Teknologi dan Sains Maklumat, Universiti Kebangsaan Malaysia, 2001.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Abu Ata, Belal Mustafa Husein. An Arabic Stemming Algorithm Based on Extensive Rules Application (ERA) for Information Retrieval: Its Development and Performance Measures. Fakulti Teknologi dan Sains Maklumat, Universiti Kebangsaan Malaysia, 2001.