APA (7th ed.) Citation

Gunn, J. E. This fortress world ([1st ed.].). Gnome Press [c1955].

Chicago Style (17th ed.) Citation

Gunn, James E. This Fortress World. [1st ed.]. New York: Gnome Press [c1955].

MLA (9th ed.) Citation

Gunn, James E. This Fortress World. [1st ed.]. Gnome Press [c1955].

Warning: These citations may not always be 100% accurate.