Soars, J. &. L., & Soars, L. (1991). Headway, Pre-Intermediate: Workbook. Oxford: Oxford University Press.
استشهاد بنمط شيكاغوSoars, John & Liz, و Liz Soars. Headway, Pre-Intermediate: Workbook. Oxford: Oxford University Press, 1991.
MLA استشهادSoars, John & Liz, و Liz Soars. Headway, Pre-Intermediate: Workbook. Oxford: Oxford University Press, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.