APA
Grewe W. G., . (2000). The Epochs of International Law. New York: Walter de Gruyter.
Chicago
Grewe Wilhelm Georg, . 2000. The Epochs of International Law. New York: Walter de Gruyter.
Harvard
Grewe W. G., . (2000). The Epochs of International Law. New York: Walter de Gruyter.
MLA
Grewe Wilhelm Georg, . The Epochs of International Law. New York: Walter de Gruyter. 2000.