LONG, Walwyn S. In Memory of Balfour Beverly Sparks. Canadian Journal of Optometry, [S. l.], v. 42, n. 4, p. 1, 1980. DOI: 10.15353/cjo.v42i4.4135. Disponível em: https://openjournals.uwaterloo.ca/index.php/cjo/article/view/4135. Acesso em: 15 jan. 2025.