Gaya APA
Heilbroner, Robert L. (1968).
The Economic Problem (2nd ed.).
New Jersey:
Prentice hall, INC.
Gaya Chicago
Heilbroner, Robert L.
The Economic Problem.
2nd ed.
New Jersey:
Prentice hall, INC,
1968.
Texts.
Gaya MLA
Heilbroner, Robert L.
The Economic Problem.
2nd ed.
New Jersey:
Prentice hall, INC,
1968.
Texts.
Gaya Turabian
Heilbroner, Robert L.
The Economic Problem.
2nd ed.
New Jersey:
Prentice hall, INC,
1968.
Texts.