 Why is pi?: A short treatise on proportionate geometry by Thomas F Black, 1974
 The Joy of Pi by David Blatner, 19971201
 The Wallis approximation of [pi]: Applications of calculus to other mathematics (UMAP modules in undergraduate mathematics and its applications) by Brindell Horelick, 1989
 Pi: A Source Book
 Bragg Curve Spectroscopy in a 4pi Geometry by D. A.; et al Cegra, 1990
 Program guide and workbook to accompany the videotape on the story of PI by Tom M Apostol, 1989
 The Wallis approximation of [pi] (UMAP module) by Brindell Horelick, 1979
 The Number Pi by Pierre Eymard, JeanPierre Lafon, 20040206
 Pi  Unleashed by JÃ¶rg Arndt, Christoph Haenel, 20010125
 Sir Cumference And The Dragon Of Pi (Turtleback School & Library Binding Edition) by Cindy Neuschwander, 19990401
 Pi, the reciprocal of seven and trigono/metrix (Essays from Earth/matriX : science in ancient artwork) by Charles William Johnson, 1999
 Pi: A Biography of the World's Most Mysterious Number by Alfred S. Posamentier, Ingmar Lehmann, 20040831
 The Foundations of Geometry and the NonEuclidean Plane by G.E. Martin, 19820322
 Easy as Pi?: An Introduction to Higher Mathematics by Oleg A. Ivanov, 19981204
