@inbook{e6d280509aea4a558adfc7c22e07369a,
title = "Teaching for abstraction: Percentages",
author = "Paul White and Michael Mitchelmore and Sue Wilson and Rhonda Faragher",
year = "2008",
language = "English",
isbn = "9789699020066",
pages = "1--323--1--323",
editor = "Olimpia Figueras and Cortina, {Jose Luis} and Silvia Alatorre and Teresa Rojano and Armando Sepulveda",
booktitle = "Proceedings of the Joint Meeting of PME 32 and PME-NA XXX",
publisher = "Cinvestav-UMSNH",
note = "Joint Conference of the International Group for the Psychology of Mathematics Education (32nd : 2008) and the North American Chapter of the Psychology of Mathematics Education (30th : 2008) ; Conference date: 17-07-2008 Through 21-07-2008",
}