Collins Cobuild English Grammar
Active English Grammar (Collins Cobuild)
COBUILD Advanced Learner's Dictionary KINDLE-ONLY EDITION
Collins Common Errors in English
Merriam-Webster's Vocabulary Builder
Easy Learning Grammar and Punctuation (Collins Easy Learning English)
Complete English Punctuation Rules: Perfect Your Punctuation and Instantly Improve Your Writing (The Farlex Grammar Book Book 2)
McGraw-Hill Handbook of English Grammar and Usage, 2nd Edition: With 160 Exercises
The Merriam-Webster Dictionary of Synonyms and Antonyms
McGraw-Hill's Conversational American English: The Illustrated Guide to Everyday Expressions of American English (McGraw-Hill ESL References)