National Council of Teachers of Mathematics & Nelson, D. (1976). Measurement in school mathematics. NCTM.
Citazione stile Chigago Style (17a edizione)National Council of Teachers of Mathematics e Doyal Nelson. Measurement in School Mathematics. Reston, VA: NCTM, 1976.
Citatione MLA (9a ed.)National Council of Teachers of Mathematics e Doyal Nelson. Measurement in School Mathematics. NCTM, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.