Dyfyniad APA

Freedman, D., Pisani, R., & Purves, R. (1998). Statistics (3rd ed.). New York: W.W. Norton.

Dyfyniad Arddull Chicago

Freedman, David, Robert Pisani, và Roger Purves. Statistics. 3rd ed. New York: W.W. Norton, 1998.

Dyfyniad MLA

Freedman, David, Robert Pisani, và Roger Purves. Statistics. 3rd ed. New York: W.W. Norton, 1998.

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