Cita APA (7th ed.)
Silk, L., & Saunders, P. (1969). The World of economics. McGraw-Hill.
Cita Chicago (17th ed.)
Silk, Leonard, i Phillip Saunders. The World of Economics. St. Louis: McGraw-Hill, 1969.
Cita MLA (9th ed.)
Silk, Leonard, i Phillip Saunders. The World of Economics. McGraw-Hill, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.