Cita APA (7th ed.)

Beardshaw, J. (1998). Economics: A student's guide (4th ed.). PEL.

Cita Chicago (17th ed.)

Beardshaw, John. Economics: A Student's Guide. 4th ed. New York: PEL, 1998.

Cita MLA (9th ed.)

Beardshaw, John. Economics: A Student's Guide. 4th ed. PEL, 1998.