Cita APA (7th ed.)
Churchill, R. V. (1972). Operational mathematics (3rd ed.). Mc Graw -Hill.
Cita Chicago (17th ed.)
Churchill, Ruel V. Operational Mathematics. 3rd ed. Tokyo: Mc Graw -Hill, 1972.
Cita MLA (9th ed.)
Churchill, Ruel V. Operational Mathematics. 3rd ed. Mc Graw -Hill, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.