1. Emotional factors in prenatal environment;Ferreira;J Nerv Ment Dis,1965
2. De ingezouten wederhelft en andere bakerpraat;Burger;VU Magazine,1991
3. De verloskunde in Vrouw Schrader's ‘Memoryboeck’;Kloosterman,1984
4. Bakerpraatjes van toen en nu;Vingerhoets;Psychologie,1990
5. The psychic state during pregnancy;Ellis,1936