Morgan, D. L., & Ashley, W. H. (1964). The West of William H. Ashley: The international struggle for the fur trade of the Missouri, the Rocky Mountains, and the Columbia, with explorations beyond the Continental Divide, recorded in the diaries and letters of William H. Ashley and his contemporaries, 1822-1838. Old West Pub. Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Morgan, Dale L., و William Henry Ashley. The West of William H. Ashley: The International Struggle for the Fur Trade of the Missouri, the Rocky Mountains, and the Columbia, with Explorations Beyond the Continental Divide, Recorded in the Diaries and Letters of William H. Ashley and His Contemporaries, 1822-1838. Denver: Old West Pub. Co., 1964.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Morgan, Dale L., و William Henry Ashley. The West of William H. Ashley: The International Struggle for the Fur Trade of the Missouri, the Rocky Mountains, and the Columbia, with Explorations Beyond the Continental Divide, Recorded in the Diaries and Letters of William H. Ashley and His Contemporaries, 1822-1838. Old West Pub. Co., 1964.