Cita APA (7th ed.)

Duncan, R. (1992). Agricultural Futures and Options. ELSEVIER.

Cita Chicago (17th ed.)

Duncan, Richard. Agricultural Futures and Options. ELSEVIER, 1992.

Cita MLA (8th ed.)

Duncan, Richard. Agricultural Futures and Options. ELSEVIER, 1992.

Atenció: Aquestes cites poden no estar 100% correctes.