Adelman, M.A.
The world petroleum market
Johns Hopkins University Press, 1972
 Buku Teks
Fischer, Fritz
Germany's aims in the First World War / Fritz Fischer
W.W. Norton & Company, 1967
 Buku Teks SO
Fischer, Fritz
World power or decline: the controversy over Germany's aims in the first world war
W.W. Norton, 1974
 Buku Teks SO
Heijbroek, A.M.A.
The world seed market : developments and strategies
Rabobank International Group , 1996
 Buku Teks
The Many faces of modern architecture : building in Germany between the World Wars
edited by John Zukowsky ; with contributions by Kennie Anne Laney-Lupton, Wojciech Lesnikowski, and John Zukowsky
Prestel-Verlag, 1994
 Buku Teks SO