 Foundations of number systems by Bruce Elwyn Meserve, 1973
 The Nashville number system: A guide to how it works by Arthur D Levine, 1981
 Algebra and Number Systems by John Hunter, etc., 19740711
 Cambridge Mathematics Direct 3 Numbers and the Number System Solutions by Mark Adams, Lynn HugginsCooper, et all 20000831
 Cambridge Mathematics Direct 4 Numbers and the Number System Teacher's book
 Tableau Systems for First Order Number Theory and Certain Higher Order Theories (Lecture Notes in Mathematics) by S.A. Toledo, 19750617
 Cambridge Mathematics Direct 2 Numbers and the Number System Activity Sheets by Jeanette Mumford, Joanne Woodward, 20020228
 ORIGINAL PATENT APPLICATION NUMBER 888328 FOR IMPROVEMENTS IN FUEL SYSTEMS FOR AIRCRAFT GAS TURBINE ENGINES (GLOUCESTER). by Dowty Fuel Systems Ltd., 1962
 Number systems;: Structure and properties by Anthony J Pettofrezzo, 1969
 The real number system, by Grace E Bates, 1960
 The Decimal System of Numbers: Illustrated and Practically Applied, by a Series of Systematic and Progressive Exercises by Dana Pond Colburn, 20100222
 The Number System Of Algebra: Treated Theoretically And Historical (1890) by Henry Burchard Fine, 20081222
 Cambridge Mathematics Direct 1 Numbers and the Number System Teacher's Book by Jeanette Mumford, 20020328
 Number systems;: An intuitive approach by Rex L Hutton, 1971
