Focus on grammar (Workbook) A basic course for reference and practice,Ngữ pháp Longman trình độ sơ cấp

od Eckstut, Samuela
Izdano 1997

Focus on grammar (Workbook) An intermediate course for reference and practice,Ngữ pháp Longman trình độ trung cấp

od Fuchs, Marjorie
Izdano 1997

The good grammar book (with answers ): A new grammar practice book for elementary to lower-intermediate students of English

od Swan, Michael
Izdano 2009