Citazione Stile APA (7a Edizione)

Spencer, M. (1986). Contemporary economics (6th. ed.). Worth.

Citazione stile Chigago Style (17a edizione)

Spencer, Milton. Contemporary Economics. 6th. ed. New York: Worth, 1986.

Citatione MLA (9a ed.)

Spencer, Milton. Contemporary Economics. 6th. ed. Worth, 1986.