APA (7th ed.) Citation

Elkind, D., & Murphy, J. (1993). Concrete operations. Davidson Films, Inc..

Chicago Style (17th ed.) Citation

Elkind, David, and Janet Murphy. Concrete Operations. San Luis Obispo, CA: Davidson Films, Inc., 1993.

MLA (9th ed.) Citation

Elkind, David, and Janet Murphy. Concrete Operations. Davidson Films, Inc., 1993.