Geoffrey Morgan
Jean Claude Sagne
Jarno Pennanen
Klaus Truol
T. G. Honer
Food and Agriculture Organization of the United Nations. Documentation Center.
Oficina Regional de Desarrollo del Norte.
Páskándi, Géza.
Noboru Tabe
Catherine Althaus
Alexander Korosi
Sharaf, Sh. G.
Richard B. Engdahl
Bert E. Swanson
United States. Agricultural Research Service. Animal Husbandry Research Division.