Sancho, A. R. (1980). Bilingual education: A three-year investigation comparing the effects of maintenance and transitional approaches on English language acquisition and academic achievement of young bilingual children. Claremont Graduate School.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sancho, Anthony Ralph. Bilingual Education: A Three-year Investigation Comparing the Effects of Maintenance and Transitional Approaches on English Language Acquisition and Academic Achievement of Young Bilingual Children. Claremont, California: Claremont Graduate School, 1980.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sancho, Anthony Ralph. Bilingual Education: A Three-year Investigation Comparing the Effects of Maintenance and Transitional Approaches on English Language Acquisition and Academic Achievement of Young Bilingual Children. Claremont Graduate School, 1980.