Fletcher Ralph and Portalupi JoAnn. Writing Workshop. The Essential Guide. - Portsmouth. Heinnemann. 2001. - 163p. ISBN: 0 325 000362 9 90000 Subjects--Topical Terms: English Language-Composition and Exercises-Study and Teaching.Forums (Discussion and Debate).Authorship- Collaboration.Group work in Education.Portalupi, JoAnn.