Warning: session_start(): open(/var/cpanel/php/sessions/alt-php81/sess_aum7oep0vi9r5m914frsgjonnk, O_RDWR) failed: No such file or directory (2) in /home/ftunma/public_html/e-library/lib/Session/Factory.php on line 59

Warning: session_start(): Failed to read session data: files (path: /var/cpanel/php/sessions/alt-php81) in /home/ftunma/public_html/e-library/lib/Session/Factory.php on line 59

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.