M. R. Cordeiro Santos, H. . Zellerkraut, and L. . Ruela de Oliveira, “Instructions for gestation course: repercussions in parents who live deeply the first gestation cycle: DOI: 10.15343/0104-7809.200832.4.2”, Mundo Saude, vol. 32, no. 4, pp. 420–429, Oct. 2008.