KNAPP, J. F.; SCHREMMER, R. D. Kansas Horse & Buggy Doctor Receives a Letter from Albert Einstein. Kansas Journal of Medicine, [S. l.], v. 5, n. 2, p. 76–77, 2012. DOI: 10.17161/kjm.v5i2.11413. Disponível em: https://journals.ku.edu/kjm/article/view/11413. Acesso em: 31 jan. 2023.