APA

Jennings R. Y., . (1960). The progress of international law. Cambridge: Cambridge University Press.

Chicago

Jennings Robert Y, . 1960. The progress of international law. Cambridge: Cambridge University Press.

Harvard

Jennings R. Y., . (1960). The progress of international law. Cambridge: Cambridge University Press.

MLA

Jennings Robert Y, . The progress of international law. Cambridge: Cambridge University Press. 1960.