Worcester, A., Eric Williamson, & Lark Bowerman. (2007). Building Skills for the TOEFL iBT: Beginning. TP. Hồ Chí Minh: Trẻ; First News.
استشهاد بنمط شيكاغوWorcester, Adam, Eric Williamson, و Lark Bowerman. Building Skills for the TOEFL IBT: Beginning. TP. Hồ Chí Minh: Trẻ; First News, 2007.
MLA استشهادWorcester, Adam, Eric Williamson, و Lark Bowerman. Building Skills for the TOEFL IBT: Beginning. TP. Hồ Chí Minh: Trẻ; First News, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.