Edgar Dale
Gilbert Highet
William Wiersma
George I. Sackheim
Marcelo Alexandrino
Émile Durkheim
Osvaldo Dolce
William Ellet
Pentagram Design
Joseph D. Novak
Dora Schulz
Henri Poincaré
Nuffield Advanced Science Project.
Leonard Vincent Koos
Francis P. Hunkins
Unknown Author
Juan José Gómez Molina
Mary Barnes
Belmira Cardoso
Sir Herbert Butterfield