Gaya APA
Callan, E, J, D, S. (1995).
Managerial economics: analysis and strategy 4th. Ed (4 th. ed.).
Singapore:
Prentice Hall.
Gaya MLA
Callan, Evan, J,, Doulas;, Scott.
"Managerial economics: analysis and strategy 4th. Ed".
4 th. ed.
Singapore:
Prentice Hall,
1995.
Text.