APA (7th ed.) Citation

Shafer, D. S., & Zhang, Z. (2012). Introductory Statistics. Saylor Foundation.

Chicago Style (17th ed.) Citation

Shafer, Douglas S., and Zhiyi Zhang. Introductory Statistics. [Place of publication not identified]: Saylor Foundation, 2012.

MLA (9th ed.) Citation

Shafer, Douglas S., and Zhiyi Zhang. Introductory Statistics. Saylor Foundation, 2012.