Autor
Koffka, Kurt, 1886-1941
3
Perls, Frederick S.
2
Castorina, José A.
1
Gobar, Ash, 1930-
1
Guillaume, Paul, 1878-1962
1
James, Muriel
1
Jongeward, Dorothy
1
Köhler, Wolfgang
1
Latner, Joel
1
Nisivoccia, Gustavo
1
Piaget, Jean, 1896-1980
1
Sander, Friedrich, 1880-1971
1
Sazbón, José
1
Stevens, John O.
1