APA (7th ed.) Citation

Merttens, R., & Cony, S. (1989). Counting to add. Octopus Pub. Group.

Chicago Style (17th ed.) Citation

Merttens, Ruth, and Sue Cony. Counting to Add. New York: Octopus Pub. Group, 1989.

MLA (9th ed.) Citation

Merttens, Ruth, and Sue Cony. Counting to Add. Octopus Pub. Group, 1989.