David L. Salvaterra
O'Grady, Standish
R. P. Phillips
Stanford Education Policy Institute.
James A. Diskant
Jorge G. Blanco Villalta
T. S. Dyman
Colin Cross
S. Heath
Patricia Joy Doyle
Clemens Brockhaus
Donald Barr
Brian O'Neill
Mark Labovitch
United States. Bureau of Agricultural Economics.
Ellis, John R.