RIVAS HERRERA, C. A., & RAMÓN VILLA, S. F. (2012). STUDENT’S WORKBOOK FOR 9th YEAR OF BASIC EDUCATION THAT SUPPORTS THE STUDY OF THE ENGLISH LANGUAGE ALONGSIDE THE TEXT BOOK “OUR WORLD THROUGH ENGLISH” N° 2.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)RIVAS HERRERA, CARLOS ALBERTO, و SERGIO FERNANDO RAMÓN VILLA. STUDENT’S WORKBOOK FOR 9th YEAR OF BASIC EDUCATION THAT SUPPORTS THE STUDY OF THE ENGLISH LANGUAGE ALONGSIDE THE TEXT BOOK “OUR WORLD THROUGH ENGLISH” N° 2. 2012.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)RIVAS HERRERA, CARLOS ALBERTO, و SERGIO FERNANDO RAMÓN VILLA. STUDENT’S WORKBOOK FOR 9th YEAR OF BASIC EDUCATION THAT SUPPORTS THE STUDY OF THE ENGLISH LANGUAGE ALONGSIDE THE TEXT BOOK “OUR WORLD THROUGH ENGLISH” N° 2. 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.