Vilbar, A. P. (2011). Effects of ESL courseware for sustainable development on grammar proficiency and reading skills of various learners. Philippine Journal for Language Teaching.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Vilbar, Aurelio P. "Effects of ESL Courseware for Sustainable Development on Grammar Proficiency and Reading Skills of Various Learners." Philippine Journal for Language Teaching 2011.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Vilbar, Aurelio P. "Effects of ESL Courseware for Sustainable Development on Grammar Proficiency and Reading Skills of Various Learners." Philippine Journal for Language Teaching, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.