Dyfyniad APA

Freedman, D., Pisani, R., & Purves, R. (1978). Instructor's mannual for statistics. W. W. Norton & Company.

Dyfyniad Arddull Chicago

Freedman, David, Robert Pisani, and Roger Purves. Instructor's Mannual for Statistics. New York: W. W. Norton & Company, 1978.

Dyfyniad MLA

Freedman, David, et al. Instructor's Mannual for Statistics. W. W. Norton & Company, 1978.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.