Cita APA (7th ed.)

Pratchett T. Terry, Stewart I. Ian, & Cohen J Jack. (2002). The Science of Discworld. London, Ebury Press, 2002.

Cita Chicago (17th ed.)

Pratchett T. Terry, Stewart I. Ian, i Cohen J Jack. The Science of Discworld. London, Ebury Press, 2002, 2002.

Cita MLA (9th ed.)

Pratchett T. Terry, et al. The Science of Discworld. London, Ebury Press, 2002, 2002.