Cita APA (7th ed.)

.Grubel, H. G. (1981). International economics. R.D. Irwin.

Cita Chicago (17th ed.)

.Grubel, Herbert G. International Economics. Homewood, Ill.: R.D. Irwin, 1981.

Cita MLA (9th ed.)

.Grubel, Herbert G. International Economics. R.D. Irwin, 1981.