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Baumgarte, Roger (2002) Cross-Gender Friendship: The troublesome friendship. (22 sider)I: Inappropiate Relationsships, the unconventional, the disapproved and the forbidden. Goodwin, Robin; Cramer, Duncan (red)Lawrence Erlbaum Associates.
Callow, Simon (1999)Love is where it falls. An Account of a passionate Friendship. Penguin.
Cappelørn, Niels Jørgen; Garff, Joakim; Kondrup, Johnny (2004) Søren Kierkegaards Skrifter, bind 9 Kjerlighedens Gjerninger .
Gee, Lisa (2004) Friends - Why men and women are from the same planet. London. Bloomsbury.(238 sider)
Lewis, C.S. The four Loves (2002). HarperCollins.
De Montaigne, Michel [1533-1592] (2005) On Friendship. Penguin. (115 sider)
Pahl, Ray (2000) On Friendship. Cambridge. Polity
Price, Anthony [1990] Love and Friendship in Plato and Aristotle. Clarendon Press.
Scudder, John R. Jr.; Bishop, Anne, H. (2001) Beyond Friendship and Eros. State University of New York Press. (128 sider)
Svare, Helge (2004) Venskab. Helsinge.Boedal. (144 sider)
Vernon, Mark (2005) The Philosophy of Friendship. Palgrave Macmillan. (182 sider)
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