Dyfyniad APA

Freedman, D., Pisani, R., & Purves, R. (2010). Statistics/4th ed. Viva Books.

Dyfyniad Arddull Chicago

Freedman, David, Robert Pisani, and Roger Purves. Statistics/4th Ed. New Delhi: Viva Books, 2010.

Dyfyniad MLA

Freedman, David, et al. Statistics/4th Ed. Viva Books, 2010.

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