Não informado. (1911). Annals of the Association of American Geographers. Association of American Geographers.
Citação do estilo Chicago (17ª ed.)Não informado. Annals of the Association of American Geographers. Washington: Association of American Geographers, 1911.
Citação MLA (8ª ed.)Não informado. Annals of the Association of American Geographers. Association of American Geographers, 1911.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.