APA

Hutchinson W., . (1955). Hutchinson's twentieth Century encyclopedia. London: Hutchinson & Co.

Chicago

Hutchinson Walter, . 1955. Hutchinson's twentieth Century encyclopedia. London: Hutchinson & Co.

Harvard

Hutchinson W., . (1955). Hutchinson's twentieth Century encyclopedia. London: Hutchinson & Co.

MLA

Hutchinson Walter, . Hutchinson's twentieth Century encyclopedia. London: Hutchinson & Co. 1955.