(2011). Everything you need to know about differentiation by David Terr. [electronic resource].
Cita Chicago (17th ed.)Everything You Need to Know About Differentiation by David Terr. [electronic Resource]. 2011.
Cita MLA (9th ed.)Everything You Need to Know About Differentiation by David Terr. [electronic Resource]. 2011.
Atenció: Aquestes cites poden no estar 100% correctes.