Cita APA (7a ed.)

Purcell, W. D., & Koontz, S. R. (1999). Agricultural futures and options: Principles and strategies (2nd edition.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Purcell, Wayne D., y Stephen R. Koontz. Agricultural Futures and Options: Principles and Strategies. 2nd edition. New Jersey: Prentice-Hall, 1999.

Cita MLA (8a ed.)

Purcell, Wayne D., y Stephen R. Koontz. Agricultural Futures and Options: Principles and Strategies. 2nd edition. Prentice-Hall, 1999.