Cita APA (7th ed.)
Robertson, W. C. (2002). Energy. NSTA Press.
Cita Chicago (17th ed.)
Robertson, William C. Energy. Arlington, Va.: NSTA Press, 2002.
Cita MLA (9th ed.)
Robertson, William C. Energy. NSTA Press, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.