APA

Churchman C. W., Dell Publishing Company, . (1968). The systems approach. New York: Delta Book.

Chicago

Churchman C West, Dell Publishing Company, . 1968. The systems approach. New York: Delta Book.

Harvard

Churchman C. W., Dell Publishing Company, . (1968). The systems approach. New York: Delta Book.

MLA

Churchman C West, Dell Publishing Company, . The systems approach. New York: Delta Book. 1968.