APA

Armstrong B., . (1932). Insuring the essentials. New York: The Macmillan.

Chicago

Armstrong Barbara, . 1932. Insuring the essentials. New York: The Macmillan.

Harvard

Armstrong B., . (1932). Insuring the essentials. New York: The Macmillan.

MLA

Armstrong Barbara, . Insuring the essentials. New York: The Macmillan. 1932.