Cita APA (7th ed.)

Freedman, D., Pisani, R., & Purves, R. (1998). Statistics (3a. ed.). W. W. Norton.

Cita Chicago (17th ed.)

Freedman, David, Robert Pisani, i Roger Purves. Statistics. 3a. ed. Nueva York: W. W. Norton, 1998.

Cita MLA (9th ed.)

Freedman, David, et al. Statistics. 3a. ed. W. W. Norton, 1998.