Abbott, J. C. (1958). Marketing problems and improvement programs. Food and Agriculture Organization of the United Nations.
Cita Chicago (17th ed.)Abbott, John Cave. Marketing Problems and Improvement Programs. Rome: Food and Agriculture Organization of the United Nations, 1958.
Cita MLA (9th ed.)Abbott, John Cave. Marketing Problems and Improvement Programs. Food and Agriculture Organization of the United Nations, 1958.
Atenció: Aquestes cites poden no estar 100% correctes.