The Antiquary: a magazine devoted to the study of the past, Volume 17 edited by Edward Walford, John Charles Cox, George Latimer Apperson - page 202
The Philadelphia Museum bulletin, Volumes 1-5 - By Pennsylvania Museum of Art, Pennsylvania Museum and School of Industrial Art, Philadelphia Museum of Art - p 14 - 1906
How the Chicken Conquered the World - By Jerry Adler and Andrew Lawler - Smithsonian magazine, June 2012Archivado el 5 de noviembre de 2012 en Wayback Machine.
How the Chicken Conquered the World - By Jerry Adler and Andrew Lawler - Smithsonian magazine, June 2012Archivado el 5 de noviembre de 2012 en Wayback Machine.