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Rais และผู้แต่งคนอื่นๆ. (1990) An economic evaluation of Kerian-Sungai Manik ingrated agricultural in the State of Perak, Malaysia . Kasetsart University/Bangkok.
Rais และผู้แต่งคนอื่นๆ. An economic evaluation of Kerian-Sungai Manik ingrated agricultural in the State of Perak, Malaysia. . Bangkok:Kasetsart University, 1990.
Rais และผู้แต่งคนอื่นๆ. (1990) An economic evaluation of Kerian-Sungai Manik ingrated agricultural in the State of Perak, Malaysia . Kasetsart University/Bangkok.