NHS UK. https://www.nhs.uk/conditions/von-willebrand-disease/
Diakses pada Juni 2019Medical News Today. https://www.medicalnewstoday.com/articles/188979.php
Diakses pada Juni 2019Healthlink BC. https://www.healthlinkbc.ca/health-topics/hw183231
Diakses pada Juni 2019Medical News Today. https://www.medicalnewstoday.com/articles/319041.php
Diakses pada Juni 2019