APA (7th ed.) Citation

INTELECOM Intelligent Telecommunications (Firm), Annenberg/CPB, Sadd, J., & Gilfillan, D. (1992). Geologic time. Annenberg/CPB.

Chicago Style (17th ed.) Citation

INTELECOM Intelligent Telecommunications (Firm), Annenberg/CPB, James Sadd, and David Gilfillan. Geologic Time. South Burlington, Vt.: Annenberg/CPB, 1992.

MLA (9th ed.) Citation

INTELECOM Intelligent Telecommunications (Firm), et al. Geologic Time. Annenberg/CPB, 1992.