APA

Gould W. L., . (1957). An introduction to international law. New York: Harper.

Chicago

Gould Wesley L, . 1957. An introduction to international law. New York: Harper.

Harvard

Gould W. L., . (1957). An introduction to international law. New York: Harper.

MLA

Gould Wesley L, . An introduction to international law. New York: Harper. 1957.