Cita APA (7th ed.)
Simpson, M. J. (2001). Hitchhiker's guide. Pocket Essentials.
Cita Chicago (17th ed.)
Simpson, M. J. Hitchhiker's Guide. Harpenden: Pocket Essentials, 2001.
Cita MLA (9th ed.)
Simpson, M. J. Hitchhiker's Guide. Pocket Essentials, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.