Roberts, Jeanne Addison. «Shades of the Triple Hecate», Proceedings of the PMR Conference 12-13 (1987-88) 47-66, abstracted in John Lewis Walker, Shakespeare and the Classical Tradition, p. 248; revisited by the author in The Shakespearean Wild: Geography, Genus, and Gender (University of Nebraska Press, 1994), passim, but especially pp.142-143, 169ff. ISBN 0-8032-8950-2, ISBN 978-0-8032-8950-5.