Spencer, M. H. (1977). Contemporary microeconomics (3rd ed.). Worth.
Lua i Stíl Chicago (17ú heag.)Spencer, Milton H. Contemporary Microeconomics. 3rd ed. New York: Worth, 1977.
Lua MLA (9ú heag.)Spencer, Milton H. Contemporary Microeconomics. 3rd ed. Worth, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.