Practical English Usage (3rd edition, 2005)
Michael Swan
The Handbook of English Pronunciation
Marnie Reed & John M. Levis
Encyclopedia of Language and Education, 2nd Edition
Nancy H. Hornberger
See You Again in Pyongyang: A Journey into Kim Jong Un's North ...
Travis Jeppesen
教师课堂教学评价指南（第5版） (教师专业实践指导丛书)
詹姆斯·波帕姆