Tilburg : Drukkerij Henri Bergmans N.V
Majalah, Jurnal, Buletin
Cambridge University Press , Cambridge : Cambridge University Press
Majalah, Jurnal, Buletin
Helen Dwight Reid Educational Foundation, {s.a}
Majalah, Jurnal, Buletin
Australia : Department of History University of Melbourne
Majalah, Jurnal, Buletin
Laiden : Nijmmegen
Majalah, Jurnal, Buletin