APA

Abt C. C., . (1970). Serious games. New York: Viking Press.

Chicago

Abt Clark C, . 1970. Serious games. New York: Viking Press.

Harvard

Abt C. C., . (1970). Serious games. New York: Viking Press.

MLA

Abt Clark C, . Serious games. New York: Viking Press. 1970.