Catalog of the Scientific Community: Ramus, Peter: Biographical facts compiled as part of the Galileo Project.
Catholic Encyclopedia: Peter Ramus: Article by William Turner on this early humanist and logician.
Champions: Petrus Ramus: Note on this thinker's work and legacy.
Columbia Encyclopedia: Ramus, Petrus: Concise entry from the 2001 edition.
History of Rhetoric: Peter Ramus: Brief note on this figure's historical status, by Wayne Stein.
MacTutor History of Mathematics: Ramus: Biography and bibliography, with links to related topics.