PIZIAK, W. Influence of psychophysical preparation in school of childbirth on the course of pregnancy and delivery. European Journal of Clinical and Experimental Medicine, [S. l.], v. 7, n. 3, p. 282–292, 2009. Disponível em: https://journals.ur.edu.pl/ejcem/article/view/13157. Acesso em: 9 jun. 2026.