| "What is the Sapir—Whorf Hypothesis? Journal of Personality and Social Psychology | The Handbook of Evolutionary Psychology, edited by David M |
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| Chapter 14, Commitment, Love, and Mate Retention by Lorne Campbell and Bruce J | Darwin's Lost Theory of Love: A Healing Vision for the 21st Century |
| Anders Nygren, Agape and Eros | Kay, Paul; Kempton, Willett March 1984 |
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