Modern Russian Grammar in Use: A systematic reference and practice book
Reading Chekhov's Stories in Russian: A Parallel-Text Russian Reader
The Big Silver Book of Russian Verbs, 2nd Edition: 555 Fully Conjugated Verbs in All Tenses (Big Book Series)
Lingo Mastery
Russian Grammar and Vocabulary Workbook: Conjunctions and Connective Words in Context to Make Your Russian More Fluent (Review and Practice)