Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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