Interested in any exploration of the dimension of friendship in the therapeutic relationship. This may include considerations of intimacy and mutuality, but I'm particularly interested in explicit considerations of "friendship" in this context.
Hi John, I know a text by Derrida referring to French philosopher Montaigne:
Derrida, J.; Montaigne, M. de (2000): Über die Freundschaft, Frankfurt (Suhrkamp).
However, I do not know if it is available in English. It's worth reading!
What I know, then, is:
Greenwood, Alice (1998): Accommodating Friends: Niceness, Meanness, and Discourse Norms, in: Hoyle, Susan M. / Adger, Carolyn Temple (Hrsg.). Kids talk. Strategic language use in later childhood, New York, Oxford University Press, S. 68–81.
Schofield, W. (1964): Psychotherapy, the Purchase of Friendship, Englewood Cliffs (Prentice Hall).
Shechtman, Z. (1991): Small Group Therapy and Preadolescent Same-Sex Friendship, in: Int. J. Group Psychotherapy 41, S. 227–243.
Shechtman, Z. (1994): Group Counseling/Psychotherapy as a School Intervention to Enhance Close Friendships in Preadolescence, in: Int. J. Group Psychotherapy 44, S. 377–391.
Tannen, Deborah (2005): Conversational style. Analyzing talk among friends, New York (Oxford University Press).
Traverso, Véronique (2009): The dilemmas of third-party complaints in conversation between friends, in: Journal of Pragmatics 41, S. 2385–2399.
This is a mixture of psychotherapeutic essays and research on friendship. I hope it makes some use for you.