Cita APA (7a ed.)

Black, J., & Bradley, J. F. (1980). Essential mathematics for economists (2nd ed.). Wiley.

Cita Chicago Style (17a ed.)

Black, John, y J. F. Bradley. Essential Mathematics for Economists. 2nd ed. Chichester [Eng.]: Wiley, 1980.

Cita MLA (9a ed.)

Black, John, y J. F. Bradley. Essential Mathematics for Economists. 2nd ed. Wiley, 1980.