Cita APA (7a ed.)

Van Vogt, A. E., & Conklin, G. (1969). The world of Null-A. Dobson.

Cita Chicago Style (17a ed.)

Van Vogt, A. E., y Groff Conklin. The World of Null-A. London: Dobson, 1969.

Cita MLA (8a ed.)

Van Vogt, A. E., y Groff Conklin. The World of Null-A. Dobson, 1969.