Saffold, R. (1962). A tutor text the slide rule. Doubleday.
Cita Chicago (17th ed.)Saffold, Robert. A Tutor Text the Slide Rule. Garden city, New York: Doubleday, 1962.
Cita MLA (9th ed.)Saffold, Robert. A Tutor Text the Slide Rule. Doubleday, 1962.
Atenció: Aquestes cites poden no estar 100% correctes.