My Last Duchess

BBC Bitesize

http://www.bbc.co.uk/schools/gcsebitesize/english_literature/poetrycharactervoice/mylastduchessrev1.shtml

Shmoop

http://www.shmoop.com/my-last-duchess/summary.html

English Tutor

http://englishtutorhome2.blogspot.co.uk/2013/06/analysis-my-last-duchess-ferrara-robert.html