Trevor-Roper, H.R.
New York Harper & Row 1957
Buku Teks SO
Cambridge University Press , Cambridge : Cambridge University Press
Majalah, Jurnal, Buletin
Tilburg : Drukkerij Henri Bergmans N.V
Majalah, Jurnal, Buletin
Australia : Department of History University of Melbourne
Majalah, Jurnal, Buletin
The University of Chicago Press,
Majalah, Jurnal, Buletin