Watson, JM and Moritz, J, The development of concepts of average, Focus on Learning Problems in Mathematics , 21, (4) pp. 15-39. ISSN 0272-8893 (1999) [Refereed Article]
Chapter in Book
Moritz, J, Reasoning about Covariation, The Challenge of Developing Statistical Literacy, Reasoning and Thinking, Kluwer Academic Publishers, D Ben-Zvi, J Garfield (ed), Dordrecht, pp. 227-255. ISBN 1-4020-2277-8 (2004) [Research Book Chapter]