APA

Cather W. S., . (1967). Not under forty. New York: A. A. Knopf.

Chicago

Cather Willa Sibert, . 1967. Not under forty. New York: A. A. Knopf.

Harvard

Cather W. S., . (1967). Not under forty. New York: A. A. Knopf.

MLA

Cather Willa Sibert, . Not under forty. New York: A. A. Knopf. 1967.