Bartleby.com: Kyd References: T.S. Eliot's essay on Hamlet from "The Sacred Wood" touches upon Kyd and "The Spanish Tragedy."
Imagi-nation: Thomas Kyd: Biography plus links to all of his works currently in print.
Legends: Shakespeare's Stories: Hamlet: Briefly discusses The Spanish Tragedy as a source for Hamlet.
Renaissance Tragedy: Comparative essay of Shakespeare's Hamlet and Thomas Kyd's The Spanish Tragedy.