Citazione Stile APA (7a Edizione)

Spencer, M. (1983). Contemporary economics (5th. ed.). Worth.

Citazione stile Chigago Style (17a edizione)

Spencer, Milton. Contemporary Economics. 5th. ed. New York: Worth, 1983.

Citatione MLA (9a ed.)

Spencer, Milton. Contemporary Economics. 5th. ed. Worth, 1983.