Cita APA (7th ed.)

Byrns, R. T., & Stone, G. W. (1989). Economics (4th ed.). Scott, Foresman.

Cita Chicago (17th ed.)

Byrns, Ralph T., i Gerald W. Stone. Economics. 4th ed. Glenview, Ill.: Scott, Foresman, 1989.

Cita MLA (8th ed.)

Byrns, Ralph T., i Gerald W. Stone. Economics. 4th ed. Scott, Foresman, 1989.