(原始内容存档于2007-05-26). James B. Wyngaarden Papers at Duke University MedicalCenter Archives (页面存档备份,存于互联网档案馆) National Institutes of Health death announcement
ISBN 978-0-340-81672-1. Sahlgrenska University Hospital. (translated from the Swedish sentence: "Cirka 10% av alla par har problem med ofrivillig barnlöshet
and Adolescents With Gender Identity Disorder Referred to a Pediatric MedicalCenter. PEDIATRICS, 129(3), 418–425. doi:10.1542/peds.2011-0907 de Vries AL