<Li> Mowat, Barbara A.; Werstine, Paul, eds. (2006). Shakespeare's Sonnets & Poems . Folger Shakespeare Library . New York: Washington Square Press . ISBN 978 - 0743273282 . OCLC 64594469 . </Li> <Li> Orgel, Stephen, ed. (2001). The Sonnets . The Pelican Shakespeare (Rev. ed .). New York: Penguin Books . ISBN 978 - 0140714531 . OCLC 46683809 . </Li> <Li> Vendler, Helen, ed. (1997). The Art of Shakespeare's Sonnets . Cambridge, MA: The Belknap Press of Harvard University Press . ISBN 0 - 674 - 63712 - 7 . OCLC 36806589 . </Li> <P> There are sonnets written by Shakespeare that occur in his plays . They differ from the 154 sonnets published in the 1609, because they may lack the deep introspection, for example, and they are written to serve the needs of a performance, exposition or narrative . </P>

When were shakespeare's sonnets written and published