Peterson, P. W. (2003). Developing writing: Writing skills practice book for EFL : beginning/intermediate level. United States Department of State.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Peterson, Patricia Wilcox. Developing Writing: Writing Skills Practice Book for EFL : Beginning/intermediate Level. Washington, DC: United States Department of State, 2003.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Peterson, Patricia Wilcox. Developing Writing: Writing Skills Practice Book for EFL : Beginning/intermediate Level. United States Department of State, 2003.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.