Ridenhou, Larry. NCA - Turkey Vulture. Snake River Birds of Prey National Conservation Area. Bureau of Land Management. [2006-12-17]. (原始内容存档于2007-05-02).
Ridenhou, Larry. NCA - Turkey Vulture. Snake River Birds of Prey National Conservation Area. Bureau of Land Management. [2006-12-17]. (原始内容存档于2007-05-02).