Essential Words for the TOEFL by 
Build Your Power Vocabulary by 
English Grammar Workbook for Dummies, with Online Practice by 
Basic American Grammar and Usage by 
English Grammar for ESL Learners by 
Longman Study Dictionary of American English by 
Merriam-Webster's Visual Dictionary by 
The American Heritage Thesaurus for Learners of English by 
The American Heritage Dictionary of Idioms for Students of English by 
