APA (7th ed.) Citation

Hoel, P. G., Port, S. C., & Stone, C. J. (1971). Introduction to probability theory. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Hoel, Paul G., Sidney C. Port, and Charles J. Stone. Introduction to Probability Theory. Boston: Houghton Mifflin, 1971.

MLA (9th ed.) Citation

Hoel, Paul G., et al. Introduction to Probability Theory. Houghton Mifflin, 1971.