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Dyfyniad Arddull ChicagoI M Crawford. Marketing and Agribusiness Texts; No.4: Marketing Research and Information Systems. Rome, Italy: FAO, 1997.
Dyfyniad MLAI M Crawford. Marketing and Agribusiness Texts; No.4: Marketing Research and Information Systems. Rome, Italy: FAO, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.