1. Kaplan & Sadock. Clinical Psychiatry Pocket Handbook, 2015.
2. Florin Tudose, Cătălina Tudose, Letitia Dobrănici. Treatise on psychopathology and psychiatry for psychologists, 2011.
3. The National Health Service (NHS) - https:// www.nhs.uk/conditions/ejaculation-problems/
4. Accuracy of fetal sex demonstration by ultrasound https://obgyn.onlinelibrary.wiley. com/doi/pdf/10.1046/j.0960-7692.2001.00477.x
5. American Pregnancy Association - http:// americanpregnancy.org/infertility/maleinfertility/