Cita APA (7th ed.)

SPENCER, D. E. (1990). Studi guide parkin economics. Addison-Wesley Pub.

Cita Chicago (17th ed.)

SPENCER, David E. Studi Guide Parkin Economics. Reading: Addison-Wesley Pub, 1990.

Cita MLA (9th ed.)

SPENCER, David E. Studi Guide Parkin Economics. Addison-Wesley Pub, 1990.