APA

Casti J. L., . (1997). Would-Be worlds. New York: John Wiley and Sons.

Chicago

Casti John L, . 1997. Would-Be worlds. New York: John Wiley and Sons.

Harvard

Casti J. L., . (1997). Would-Be worlds. New York: John Wiley and Sons.

MLA

Casti John L, . Would-Be worlds. New York: John Wiley and Sons. 1997.