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Gaya APA

Leavenworth, E, L, G, &, W, G, I, &, R, S. (1970). Principles of Engineering Economy . Indonesia: Ronald Press Company.

Gaya MLA

Leavenworth, Eugene, L., Grant, &, W., Grant, Ireson, &, Richard, S.. "Principles of Engineering Economy". Indonesia: Ronald Press Company, 1970. Text.