Cita APA (7a ed.)

Silk, L. S. (1975). Contemporary economics principles and issues. McGraw-Hill.

Cita Chicago Style (17a ed.)

Silk, Leonard S. Contemporary Economics Principles and Issues. Nueva York: McGraw-Hill, 1975.

Cita MLA (9a ed.)

Silk, Leonard S. Contemporary Economics Principles and Issues. McGraw-Hill, 1975.