Simpson, G. G. (1949). The meaning of evolution: A study of the history of life and of its significance for man. Yale Univ. Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Simpson, George Gaylord. The Meaning of Evolution: A Study of the History of Life and of Its Significance for Man. New Haven: Yale Univ. Press, 1949.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Simpson, George Gaylord. The Meaning of Evolution: A Study of the History of Life and of Its Significance for Man. Yale Univ. Press, 1949.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.