Certain Speculations on Hamlet, the Calendar, and Martin Luther - Steve Sohmer argues that Shakespeare linked the principal events in Hamlet to particular holy days, and that the play's first audiences could identify these holy days from cues in the text. - http://extra.shu.ac.uk/emls/02-1/sohmshak.html
Renaissance Tragedy and Investigator Heroes - Article focusing on Hamlet and Thomas Kyd's The Spanish Tragedy. - http://www.literature-study-online.com/essays/renaissance_tragedy_investigators.html
The Origin of Hamlet: All The Year Round - From the 8th February 1879 edition of Charles Dickens's journal "All The Year Round." Mainly a discussion of The Hystorie of Hamblet, an anonymous English novel based on Belleforest and Saxo Grammaticus, which may have been used as a source for - http://shakespearean.org.uk/ham1-dic.htm
Table Talk on Hamlet - By Samuel Taylor Coleridge. Very short notes on Hamlet: Polonius and Hamlet with Ophelia. Taken as extracts from Coleridge's "Table Talk." - http://shakespearean.org.uk/ham2-col.htm
O'ertopping Pelion: Hamlet, Laertes, and the Revenge Tradition - Hardin Aasand suggests that the early editions of Hamlet (Q1, Q2, F1) convey disparities in their treatment of Hamlet's and Laertes's disposition at Ophelia's graveyard. - http://www.unibas.ch/shine/revengeaasand.htm