RAUNKIÆR, B. Gervais Lyons: Afghanistan: The Buffer State. Great Britain and Russia in Central Asia. (8VO. VII + 282 Sider + Index. 2 Kort. — Madras:Higginbotham&Co. 1910 London : Luzac & Co. Geografisk Tidsskrift, [S. l.], v. 22, 1914. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/46839. Acesso em: 6 maj. 2024.