Dr. Roy T. Sawyer (Open Library) - Leech Museum
Encyclopedia of Life: Hirudo medicinalis - Medicinal Leech
BDELLANEA - Blogspot by Mark Siddall
Bloodsuckers - When modern medicine needs some help, surgeons call in mother nature's little helper. December 2001. Discover Magazine.
Animal Species: Leeches. Australian Museum.
Medicinal Leeches: Nature’s Finest Surgical Tool From the Swamps. Vol. 8, 2011. Yale Journal of Medicine & Law.