Irene, S. B. G. (2002). Learner external factors influencing the proficiency of primary school students learning english as a second language.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Irene, Soon Bee Gaik. Learner External Factors Influencing the Proficiency of Primary School Students Learning English as a Second Language. 2002.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Irene, Soon Bee Gaik. Learner External Factors Influencing the Proficiency of Primary School Students Learning English as a Second Language. 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.