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