Churchill, R. V. (1972). Operational mathematics (3rd ed.). New York: McGraw-Hill Book Company.
Παραπομπή Chicago StyleChurchill, Ruel V. Operational Mathematics. 3rd ed. New York: McGraw-Hill Book Company, 1972.
Παραπομπή MLAChurchill, Ruel V. Operational Mathematics. 3rd ed. New York: McGraw-Hill Book Company, 1972.
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