Cita APA

Johnson, D., & David Johnson; James Michael Stewart; Andy Ruth. A. Cambridge, MA: Course Technology.

Chicago Style Citation

Johnson, David, i David Johnson; James Michael Stewart; Andy Ruth. A. Cambridge, MA: Course Technology.

Cita MLA

Johnson, David, i David Johnson; James Michael Stewart; Andy Ruth. A. Cambridge, MA: Course Technology.

Atenció: Aquestes cites poden no estar 100% correctes.