Bongkoj Wibultananun และผู้แต่งคนอื่นๆ. (2006) Estimators in finite population sampling on successive occasions. National Institute of Development Administration:ม.ป.ท.Bongkoj Wibultananun และผู้แต่งคนอื่นๆ. 2006. Estimators in finite population sampling on successive occasions. ม.ป.ท.:National Institute of Development Administration;Bongkoj Wibultananun และผู้แต่งคนอื่นๆ. Estimators in finite population sampling on successive occasions. ม.ป.ท.:National Institute of Development Administration, 2006. Print.