National Foundation for Educational Research in England and Wales & Downing, J. A. (1967). The i.t.a. symposium: Research report on the British experiment with i.t.a. National Foundation for Educational Research in England and Wales.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Foundation for Educational Research in England and Wales و John A. Downing. The I.t.a. Symposium: Research Report on the British Experiment with I.t.a. Slough: National Foundation for Educational Research in England and Wales, 1967.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Foundation for Educational Research in England and Wales و John A. Downing. The I.t.a. Symposium: Research Report on the British Experiment with I.t.a. National Foundation for Educational Research in England and Wales, 1967.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.