(1958). The teaching of arithmetic and mathematics to students between 6 and 15 years of age in the Netherlands. Wolters.
Chicago-Zitierstil (17. Ausg.)The Teaching of Arithmetic and Mathematics to Students Between 6 and 15 Years of Age in the Netherlands. Groningen: Wolters, 1958.
MLA-Zitierstil (9. Ausg.)The Teaching of Arithmetic and Mathematics to Students Between 6 and 15 Years of Age in the Netherlands. Wolters, 1958.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.