CASTELNOVI, M. The Training Of Travelers According To Arturo Issel (With Inedit Archive Documents 1889-1891). Bollettino della Società Geografica Italiana, [S. l.], p. 429–460, 2006. DOI: 10.36253/bsgi-7091. Disponível em: https://www.bsgi.it/index.php/bsgi/article/view/7091. Acesso em: 16 oct. 2026.