APA (7th ed.) Citation

Merttens, R., & Goffe, T. (1989). Numbers and sets. Octopus Pub. Group.

Chicago Style (17th ed.) Citation

Merttens, Ruth, and Toni Goffe. Numbers and Sets. New York: Octopus Pub. Group, 1989.

MLA (9th ed.) Citation

Merttens, Ruth, and Toni Goffe. Numbers and Sets. Octopus Pub. Group, 1989.

Warning: These citations may not always be 100% accurate.