Raymond T. McNally: Dracula Was a Woman: In Search of the Blood Countess of Transylvannia.

Sabine Baring-Gould: A Hungarian Bather in Blood" in The Book of Werewolves.

Penrose Valentine: Erzsebet Bathory, La Comtesse Sanglante (originally in French, an English translation is available: The Bloody Countess)

Ronay Gabriel: The Truth About Dracula.

Andrei Codrescu: The Blood Countess (a fictional account of E. Bathory's life, although Codrescu did have access to Hungarian State Archive documents that were previously unseen and claims the details of her life were taken from these documents)

Raymond T. McNally and Radu Florescu: In Search of Dracula.