Clayton, N. (1997). Young living (Seventh edition.). Glencoe/McGraw-Hill.
Cita Chicago (17th ed.)Clayton, Nanalee. Young Living. Seventh edition. New York: Glencoe/McGraw-Hill, 1997.
Cita MLA (8th ed.)Clayton, Nanalee. Young Living. Seventh edition. Glencoe/McGraw-Hill, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.