by Cowley, Deborah S., Roy-Byrne, Peter P., Greenblatt, David J., Hommer, Daniel W.
Published in Psychiatry research (01.05.1993)

by Davis, Kenneth L., Panksepp, Jaak, Normansell, Larry
Published in Neuro-psychoanalysis (Madison, Conn.) (01.01.2003)

by Churchyard, Jamie Stuart
Year of Publication 2014

by Hamachek, Don E
Year of Publication 1968