ROSENBERG, E. The National Association of Professional Base Ball Players: The Origins of Professional Baseball and the American Identity. Vanderbilt Undergraduate Research Journal, [S. l.], v. 8, 2012. DOI: 10.15695/vurj.v8i0.3522. Disponível em: https://ejournals.library.vanderbilt.edu/index.php/vurj/article/view/3522. Acesso em: 26 may. 2022.