Postlethwaite, T. N. (1973). A selection from the overall findings of the IEA study in science, reading comprehension, literature, French as a foreign language, English as a foreign language and civic education. International Institute for Educational Planning.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Postlethwaite, T. Neville. A Selection from the Overall Findings of the IEA Study in Science, Reading Comprehension, Literature, French as a Foreign Language, English as a Foreign Language and Civic Education. Paris: International Institute for Educational Planning, 1973.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Postlethwaite, T. Neville. A Selection from the Overall Findings of the IEA Study in Science, Reading Comprehension, Literature, French as a Foreign Language, English as a Foreign Language and Civic Education. International Institute for Educational Planning, 1973.