APA Edition Citation

Ashlock, R. B., Engelhardt, J., & Wiebe, J. H. Helping children understand and use numerals.

Chicago Edition Citation

Ashlock, Robert B., Jonm Engelhardt, and James H. Wiebe. Helping Children Understand and Use Numerals. Boston, Allyn and Bacon.

MLA Edition Citation

Ashlock, Robert B., et al. Helping Children Understand and Use Numerals.