Chukiat Viwatwongkasem และผู้แต่งคนอื่นๆ. (2005) Estimating the Binomial proportion and the risk difference in multi-center studies with adjusting sparsity. National Institute of Development Administration:ม.ป.ท.Chukiat Viwatwongkasem และผู้แต่งคนอื่นๆ. 2005. Estimating the Binomial proportion and the risk difference in multi-center studies with adjusting sparsity. ม.ป.ท.:National Institute of Development Administration;Chukiat Viwatwongkasem และผู้แต่งคนอื่นๆ. Estimating the Binomial proportion and the risk difference in multi-center studies with adjusting sparsity. ม.ป.ท.:National Institute of Development Administration, 2005. Print.