Wimon Sonchaem และผู้แต่งคนอื่นๆ. (2001) A study of controlled sampling with varying probabilities without replacement. National Institute of Development Administration:ม.ป.ท.Wimon Sonchaem และผู้แต่งคนอื่นๆ. 2001. A study of controlled sampling with varying probabilities without replacement. ม.ป.ท.:National Institute of Development Administration;Wimon Sonchaem และผู้แต่งคนอื่นๆ. A study of controlled sampling with varying probabilities without replacement. ม.ป.ท.:National Institute of Development Administration, 2001. Print.