Παραπομπή APA

Garma, P. D. (1960). Engineering economy/3e. The McMillan Co.

Παραπομπή Chicago Style

Garma, Paul De. Engineering Economy/3e. NewYork: The McMillan Co, 1960.

Παραπομπή MLA

Garma, Paul De. Engineering Economy/3e. The McMillan Co, 1960.