Walborg Thorsell
Horace Wesley Stunkard
Alan Mozley
Klaus Odening
International Liverfluke Colloquium, 2d, Agricultural University of Wageningen, 1967
Hilario de Gouvêa
Samuel Mehl
United States. Agricultural Research Service
Don R. Morrill
Carla Jean Farrell
Kurt Laspeyres
Arthur Looss
Donald Harold Helfer
Edgar Cáceres
United States. Agricultural Research Service. Animal Disease and Parasite Research Division.
J. N. Shaw
Liv Schröder
Richard William Bond
Joseph E. Alicata