Cita APA (7th ed.)

Boyes,William, & Melvin, M. (1991). Economics. Houghton Mifflin.

Cita Chicago (17th ed.)

Boyes,William, i Michael Melvin. Economics. Boston: Houghton Mifflin, 1991.

Cita MLA (9th ed.)

Boyes,William, i Michael Melvin. Economics. Houghton Mifflin, 1991.