O'RahillyR., MüllerF.. Developmental Stages in Human Embryos.Washington, DC: Carnegie Institution of Washington;1987. Publication 637.
11.
SperberG.H.. Craniofacial Development.Hamilton, Ontario: BC Decker;2001.
12.
VacherC., OnolfoJ.P., LezyJ.P., CopinH.. The growth of the maxilla in humans. What place for premaxilla?Rev Stomatol Chir Maxillofac2001; 102: 155–158.
13.
WarbrickJ.C.. The early development of the nasal cavity and upper lip in the human embryo.J Anat.1960; 94: 351–362.
14.
WoodN.K., WraggL.E., StutevilleO.H.. The premaxilla: embryological evidence that it does not exist in man.Anat Rec.1967; 158: 485–490.