Sherwood, G. H. (1920). Free nature education by the American Museum of Natural History in public schools and colleges: History and status of museum instruction and its extension to the schools of greater New York and vicinity. The Museum.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sherwood, George Herbert. Free Nature Education by the American Museum of Natural History in Public Schools and Colleges: History and Status of Museum Instruction and Its Extension to the Schools of Greater New York and Vicinity. New York: The Museum, 1920.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sherwood, George Herbert. Free Nature Education by the American Museum of Natural History in Public Schools and Colleges: History and Status of Museum Instruction and Its Extension to the Schools of Greater New York and Vicinity. The Museum, 1920.