p44 Marsh, Meredith; Alagona, Peter S. "AP Human Geography 2008", Barron's Educational Series, 91–92, 2008 Goodchild, Michael. The Validity and Usefulness
(原始内容存档于2024-01-29) (法语). Mathews, Gregory M.; Keulemans, J. G.; Grönvold, Henrik; Goodchild, H.; Lodge, George Edward; Green, Roland. The Birds of Australia 6. Witherby
03.011 (英语). Mathews, Gregory M.; Keulemans, J. G.; Grönvold, Henrik; Goodchild, H.; Lodge, George Edward; Green, Roland. The Birds of Australia 6. Witherby