APA

Bellow S., . (1975). Humboldt's gift. New York: Viking Press.

Chicago

Bellow Saul, . 1975. Humboldt's gift. New York: Viking Press.

Harvard

Bellow S., . (1975). Humboldt's gift. New York: Viking Press.

MLA

Bellow Saul, . Humboldt's gift. New York: Viking Press. 1975.