Ryan, M., Abeyratne, F., & Farrington, J. (1981). Animal draught: The economics of revival. Agrarian Research and Training Institute.
Citace podle Chicago (17th ed.)Ryan, M., Fredrick Abeyratne, a Joseph Farrington. Animal Draught: The Economics of Revival. Colombo, Sri Lanka: Agrarian Research and Training Institute, 1981.
Citace podle MLA (8th ed.)Ryan, M., et al. Animal Draught: The Economics of Revival. Agrarian Research and Training Institute, 1981.
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