- 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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