P. J. Schmidt
Jeremy Rifkin
M. Eugene Ensminger
Unknown Author
United States. Bureau of Animal Industry
John H. Landers
Jean Boichard
Marit Jerven
World Charolais Congress (28th 1993 Alghero, Sardinia, Italy)
Roger B. Long
Derek H. Goodwin
W. W. Heinemann
Alexis Pourrain
Enrique Robert Luján
A. T. Ralston
United States. Animal and Plant Health Inspection Service
Donald C. Huffman