Sources list for MACBETH AND THE SPANISH TRAGEDY VIEWED THROUGH FEMALE EYES:

Kyd, Thomas. The Spanish Tragedy: A Play. Ed. J. Schick. London: J.M. Dent and Co., 1898.
Plays within Plays

Kyd, Thomas, & Bevington, David M. (1996). The Spanish tragedy. Manchester ; New York University Press ; Distributed exclusively in the USA and Canada by St. Martin's Press.
Hamlet

Thomas K And David M. B. The Spanish Tragedy. St. Martin's Press. Jul. 1996.
Shakespeare Compared

Frankardolino. Apocalypse & Armada in Kyd's Spanish Tragedy. Kirksville, MO: Truman State University Press, 1995.
Plays within Plays

Kyd, Thomas, & Bevington, David M. (1996). The Spanish tragedy. Manchester ; New York New York: Manchester University Press ; Distributed exclusively in the USA and Canada by St. Martin's Press.
Hamlet the Hero