Cita APA (7a ed.)

Ryan, J., & Richards, J. (1996). Business studies today (4th ed.). Cambridge University Press.

Cita Chicago Style (17a ed.)

Ryan, John, y John Richards. Business Studies Today. 4th ed. Cambridge, United Kingdom: Cambridge University Press, 1996.

Cita MLA (9a ed.)

Ryan, John, y John Richards. Business Studies Today. 4th ed. Cambridge University Press, 1996.