APA

Carnegie D., . (1959). Lincoln the unknown. New York: Dale Carnegie & Associates, Inc.

Chicago

Carnegie Dale, . 1959. Lincoln the unknown. New York: Dale Carnegie & Associates, Inc.

Harvard

Carnegie D., . (1959). Lincoln the unknown. New York: Dale Carnegie & Associates, Inc.

MLA

Carnegie Dale, . Lincoln the unknown. New York: Dale Carnegie & Associates, Inc. 1959.