Kennedy (1992)

Lang (1968)

LeDoux (1984)

LeDoux (1987)

LeDoux (1994)

LeDoux (1996)

LeDoux (2012)

LeDoux (2013)

LeDoux (2017)

MacLean (1949)

MacLean (1952)

MacLean (1970)

Mandler, Kessen (1964)

Marx (1951)

Mitchell et al (eds) (1996)

Olds (1956)

Panksepp (1998)

Panksepp, Biven (2012)

Papez (1937)

Penn et al (2008)