Schwartz, William (2012). The 5-minute pediatric consult (6th edición). Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. p. 535. ISBN9781451116564. Consultado el 9 de mayo de 2020.
Lachner, C; Steinle, NI; Regenold, WT (2012). «The neuropsychiatry of vitamin B12 deficiency in elderly patients.». The Journal of Neuropsychiatry and Clinical Neurosciences24 (1): 5-15. PMID22450609. doi:10.1176/appi.neuropsych.11020052.
Lachner, C; Steinle, NI; Regenold, WT (2012). «The neuropsychiatry of vitamin B12 deficiency in elderly patients.». The Journal of Neuropsychiatry and Clinical Neurosciences24 (1): 5-15. PMID22450609. doi:10.1176/appi.neuropsych.11020052.