Thayer, R. E. (2000). Mood. In A. E. Kazdin (Ed.), Encyclopedia of psychology (Vol. 5, pp. 294-295). Washington, DC: American Psychological Association.
http://dx.doi.org/10.1037/10520-125
Discusses the term mood which are similar to emotions but of longer durations and are probably controlled by the brain and are associated with its important arousal and limbic system. (PsycINFO Database Record (c) 2016 APA, all rights reserved)