Sirifa Srichit. (1985). The development of a self-instructional unit on the indefinite article and its effectiveness in English Language teaching in Srinakharinwirot Prasarnmit Demonstration School Bangkok, Thailand.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sirifa Srichit. The Development of a Self-instructional Unit on the Indefinite Article and Its Effectiveness in English Language Teaching in Srinakharinwirot Prasarnmit Demonstration School Bangkok, Thailand. 1985.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sirifa Srichit. The Development of a Self-instructional Unit on the Indefinite Article and Its Effectiveness in English Language Teaching in Srinakharinwirot Prasarnmit Demonstration School Bangkok, Thailand. 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.