OLUFSE, O. Handbook of travel. Prepared by The Harvard Travelers Club. Cambridge, (Mass. U.S.A.) Harvard University Press 1917. Geografisk Tidsskrift, [S. l.], v. 24, 1918. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/47032. Acesso em: 7 maj. 2024.