Grammar dimensions : form, meaning, and use - Larsen-Freeman, Diane (Heinle & Heinle, 2000)
Book 1 by Victoria Badalamenti, Carolyn Henner Stanchina. – Book 2 by Heidi Riggenbach, Virginia Samuda. – Book 3 by Stephen H. Thewlis. – Book 4 by Jan Frodesen, Janet Eyring