Walker, E., Ban biên dịch First news, & Elsworth, S. (2004). New edition grammar practice for Upper - Intermediate students. Tp. Hồ Chí Minh: Nxb. Trẻ.
استشهاد بنمط شيكاغوWalker, Elaine, Ban biên dịch First news, و Steve Elsworth. New Edition Grammar Practice for Upper - Intermediate Students. Tp. Hồ Chí Minh: Nxb. Trẻ, 2004.
MLA استشهادWalker, Elaine, Ban biên dịch First news, و Steve Elsworth. New Edition Grammar Practice for Upper - Intermediate Students. Tp. Hồ Chí Minh: Nxb. Trẻ, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.