Pornwipa Muangprakaew. (2005) The effects of the squatting position on the second stage of labor in term primigra vida. Mahidol University,:ม.ป.ท.Pornwipa Muangprakaew. 2005. The effects of the squatting position on the second stage of labor in term primigra vida. ม.ป.ท.:Mahidol University,;Pornwipa Muangprakaew. The effects of the squatting position on the second stage of labor in term primigra vida. ม.ป.ท.:Mahidol University, 2005. Print.