Sibert, A. E. (1982). The key-personnel strategy in upgrading the quality of teachers of English in secondary schools: The Kedah case.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sibert, Anthony Ernest. The Key-personnel Strategy in Upgrading the Quality of Teachers of English in Secondary Schools: The Kedah Case. 1982.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sibert, Anthony Ernest. The Key-personnel Strategy in Upgrading the Quality of Teachers of English in Secondary Schools: The Kedah Case. 1982.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.