Viáfara, J. J. (2013). Comparing L1 With L2 Acquisition: How Learning Factors and Stages Reveal Differences and Similarities Between the Two Processes. Universidad Pedagógica y Tecnológica de Colombia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Viáfara, John Jairo. Comparing L1 With L2 Acquisition: How Learning Factors and Stages Reveal Differences and Similarities Between the Two Processes. Universidad Pedagógica y Tecnológica de Colombia, 2013.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Viáfara, John Jairo. Comparing L1 With L2 Acquisition: How Learning Factors and Stages Reveal Differences and Similarities Between the Two Processes. Universidad Pedagógica y Tecnológica de Colombia, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.
