Blackwelder, R. E., & Blackwelder, R. M. (1961). Directory of zoological taxonomists of the world. Published for the Society of Systematic Zoology by Southern Illinois University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Blackwelder, Richard E., و Ruth M. Blackwelder. Directory of Zoological Taxonomists of the World. Carbondale, Ill.: Published for the Society of Systematic Zoology by Southern Illinois University Press, 1961.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Blackwelder, Richard E., و Ruth M. Blackwelder. Directory of Zoological Taxonomists of the World. Published for the Society of Systematic Zoology by Southern Illinois University Press, 1961.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.