- Developing Numeracy: Numbers and the Number System: Year 1: Activities for the Daily Maths Lesson (Developings) by Paul Broadbent,  2005-08-03
 - The real number system (Wadsworth precalculus mathematics series) by Charles C Carico,  1974
 - Number systems: A modern introduction (Addison-Wesley series in science and mathematics education) by Mervin Laverne Keedy,  1965
 - Modern Basic Mathematics, Number Systems - Structure (Book 1 - Teacher's Edition) by Kenneth C. & Edward H. Whitmore Skeen,  1964
 - Cambridge Mathematics Direct 4 Numbers and the Number System Pupil's book 
 - The real number system in an algebraic setting (A Series of undergraduate books in mathematics. Golden Gate books) by Joe Roberts,  1962
 - Cambridge Mathematics Direct 6 Numbers and the Number System Teacher's book 
 - A Development of the Rational Number System; a Programmed Text by Murray Abramson,  1970-01-01
 - Maths Plus: Numbers and the Number System by Paul Broadbent, K. Church, et all  1999-09-16
 - The person-number systems of Sweden, Norway, Denmark, and Israel (Vital and health statistics : Series 2, Data evaluation and methods research ; no. 84) by United States,  1980
 - How to attain success through the strength of vibration of numbers: A system of numbers as taught by Pythagoras by Sarah Joanna Balliett,  1969
 - The Number Crew: Pt. 2: Numbers and the Number System 2 - Activity Book by Chris Ellis, Marjorie Gorman,  2000-08
 - A portrait of 2;: A brief survey of the elementary number systems by Lawrence A Ringenberg,  1967
 - Cambridge Mathematics Direct 5 Numbers and the Number System Teacher's Handbook 
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