APA (7th ed.) Zitazioa

Willoughby, S. S. (1968). Probability and statistics. Silver Burdett.

Chicago Style (17th ed.) Zitazioa

Willoughby, Stephen S. Probability and Statistics. Morristown: Silver Burdett, 1968.

MLA (9th ed.) Zitazioa

Willoughby, Stephen S. Probability and Statistics. Silver Burdett, 1968.