Soars, L., & Soars, J. (2009). American headway. 3.(workbook): The world's most tursted English course(workbook. Oxford University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Soars, Liz, و John Soars. American Headway. 3.(workbook): The World's Most Tursted English Course(workbook. New York: Oxford University Press, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Soars, Liz, و John Soars. American Headway. 3.(workbook): The World's Most Tursted English Course(workbook. Oxford University Press, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.