APA

Friend J. W., . (1991). The linchpin. New York: Praeger.

Chicago

Friend Julius W, . 1991. The linchpin. New York: Praeger.

Harvard

Friend J. W., . (1991). The linchpin. New York: Praeger.

MLA

Friend Julius W, . The linchpin. New York: Praeger. 1991.