| Chapter 14, Commitment, Love, and Mate Retention by Lorne Campbell and Bruce J | The Handbook of Evolutionary Psychology, edited by David M |
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| Darwin's Lost Theory of Love: A Healing Vision for the 21st Century | 16 2 : 265—27 [, ], |
Kay, Paul; Kempton, Willett March 1984.
| Anders Nygren, Agape and Eros | "A triangular theory of love" |
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