Whitman, R. L. (1969). Interference in language learning: A theory of contrastive analysis with examples from Japanese and English. University of Pennsylvania.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Whitman, Randal Loring. Interference in Language Learning: A Theory of Contrastive Analysis with Examples from Japanese and English. Philadelphia: University of Pennsylvania, 1969.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Whitman, Randal Loring. Interference in Language Learning: A Theory of Contrastive Analysis with Examples from Japanese and English. University of Pennsylvania, 1969.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.