APA

Steinbeck J., . (1991). The grapes of wrath. New York: Penguin books.

Chicago

Steinbeck J, . 1991. The grapes of wrath. New York: Penguin books.

Harvard

Steinbeck J., . (1991). The grapes of wrath. New York: Penguin books.

MLA

Steinbeck J, . The grapes of wrath. New York: Penguin books. 1991.