Cita APA (7th ed.)

BARNES, R. (1967). Fundamentals of economics. Butterworths.

Cita Chicago (17th ed.)

BARNES, R.J. Fundamentals of Economics. London: Butterworths, 1967.

Cita MLA (9th ed.)

BARNES, R.J. Fundamentals of Economics. Butterworths, 1967.