@inbook{Sun_2018,
title={The What and Why of Whole Number Arithmetic: Foundational Ideas from History,
Language and Societal Changes},
ISBN={9783319635552},
ISSN={2215-1745},
url={http://dx.doi.org/10.1007/978-3-319-63555-2_5},
DOI={10.1007/978-3-319-63555-2_5},
booktitle={Building the Foundation: Whole Numbers in the Primary Grades},
publisher={Springer International Publishing},
author={Sun,
Xu Hua and Chambris,
Christine and Sayers,
Judy and Siu,
Man Keung and Cooper,
Jason and Dorier,
Jean-Luc and de Lora Sued,
Sarah Inés González and Thanheiser,
Eva and Azrou,
Nadia and McGarvey,
Lynn and Houdement,
Catherine and Ejersbo,
Lisser Rye},
year={2018},
pages={91–124} }