Sawyer, Roy T, 2013. History of the Leech Trade in Ireland, 1750–1915: Microcosm of a Global Commodity

Sawyer, Roy T, FOP Hechtel, J Hagy & E Scacheri, 1998. A study in medical history: Introduction of medicinal leeches into West Indies in 19th century

Sawyer, Roy T, A Taylor and MJH Sahat, 1982. The leeches of Brunei (Annelida:Hirudinea), with a checklist and key to the known and expected freshwater, terrestrial and marine leeches

Manum, SB, MN Bose and Roy T Sawyer, 1992. Seeds (Burejospermum KRASSILOV) and palynomorphs (Dictyothylakos HORST) with a netted wall structure reinterpreted: Clitellate cocoons

Kyriakides, M A, Roy T Sawyer, S L Allen and M G Simpson, 1990. Mechanism of action of triethyltin on identified leech neurons. Toxicology Letters 53: 285-295

Minelli, A and Roy T Sawyer, 1990. La Moda Delle Sanguisughe, in Il Farmaco Nei Tempi. Antichi Farmaci. Farmitalia Carol Erba/ B. go S. ta Brigida, Parma, Italy