Cushman, Stephen, and Cavanagh, Clare, eds. The Princeton Encyclopedia of Poetry and Poetics : Fourth Edition (4). Princeton, US: Princeton University Press, 2012. ProQuest ebrary. Web. 22 December 2016.Copyright © 2012. Princeton University Press. All rights reserved.

Cushman, Stephen, and Cavanagh, Clare, eds. The Princeton Encyclopedia of Poetry and Poetics : Fourth Edition (4). Princeton, US: Princeton University Press, 2012. ProQuest ebrary. Web. 22 December 2016.Copyright © 2012. Princeton University Press. All rights reserved.

Cushman, Stephen, and Cavanagh, Clare, eds. The Princeton Encyclopedia of Poetry and Poetics : Fourth Edition (4). Princeton, US: Princeton University Press, 2012. ProQuest ebrary. Web. 22 December 2016.Copyright © 2012. Princeton University Press. All rights reserved.