Rutkowska, A., Rolińska, A., Kwaśniewski, W., Makara-Studzińska, M., & Kwaśniewska, A. (2011). Anxiety as a state and trait in women with normal and highly compromised pregnancy. Current Problems of Psychiatry, 12(1), 56-59. https://czasopisma.umlub.pl/cpp/article/view/2146