Peña Ledesma, V. L., & Sánchez Romero, G. E. (2013). Factors that affect the English language teaching-learning process in Ecuadorian public high schools.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Peña Ledesma, Vanessa Lizet, و Gladys Esperanza Sánchez Romero. Factors That Affect the English Language Teaching-learning Process in Ecuadorian Public High Schools. 2013.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Peña Ledesma, Vanessa Lizet, و Gladys Esperanza Sánchez Romero. Factors That Affect the English Language Teaching-learning Process in Ecuadorian Public High Schools. 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.