Cita APA (7th ed.)
Rubel, D. (2005). The coming free (1st American ed.). DK Pub..
Cita Chicago (17th ed.)
Rubel, David. The Coming Free. 1st American ed. New York, N.Y.: DK Pub., 2005.
Cita MLA (9th ed.)
Rubel, David. The Coming Free. 1st American ed. DK Pub., 2005.
Atenció: Aquestes cites poden no estar 100% correctes.