Soars, J., & Soars, L. (1989). Headway advanced: Student's Book. New York: Oxford University Press.
استشهاد بنمط شيكاغوSoars, John, و Liz Soars. Headway Advanced: Student's Book. New York: Oxford University Press, 1989.
MLA استشهادSoars, John, و Liz Soars. Headway Advanced: Student's Book. New York: Oxford University Press, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.