Cita APA (7th ed.)

Freedman, D., Pisani, R., & Purves, R. (1980). Statistics (1a. ed.). W. W. Norton and Company.

Cita Chicago (17th ed.)

Freedman, David, Robert Pisani, i Roger Purves. Statistics. 1a. ed. Nueva York: W. W. Norton and Company, 1980.

Cita MLA (9th ed.)

Freedman, David, et al. Statistics. 1a. ed. W. W. Norton and Company, 1980.