Plummer, Ellen S.; Crary, Shelley E.; Buchanan, George R. Prominent forehead hematomas ("goose-eggs") as an initial manifestation of hemophilia. The Journal of Pediatrics. 2013, 163 (6): 1781––1783. PMID 23968747. doi:10.1016/j.jpeds.2013.07.012.
Plummer, Ellen S.; Crary, Shelley E.; Buchanan, George R. Prominent forehead hematomas ("goose-eggs") as an initial manifestation of hemophilia. The Journal of Pediatrics. 2013, 163 (6): 1781––1783. PMID 23968747. doi:10.1016/j.jpeds.2013.07.012.