Leo, A. (1984). A classroom interaction study focusing on the variety of English used by primary two teachers in Singapore.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Leo, Andra. A Classroom Interaction Study Focusing on the Variety of English Used by Primary Two Teachers in Singapore. 1984.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Leo, Andra. A Classroom Interaction Study Focusing on the Variety of English Used by Primary Two Teachers in Singapore. 1984.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.