The authoritative edition of Twelfth Night from The Folger Shakespeare Library, the trusted and widely used Shakespeare series for students and general readers, includes:
Essay by Catherine Belsey
Edited by Barbara A. Mowat and Paul Werstine
Visit Folger.edu for more resources, including overviews of each play, information about Shakespeare's world, and teaching modules..
William Shakespeare, 2009, Paperback, 272 Pages. ISBN-13: 978-0-7434-8277-6.