Starting places

The Therapeutic Potential of Creative Writing: Writing Myself by Gillie Bolton (Jessica Kingsley, 1999)
The Self on the Page - Theory and Practice of Creative Writing in Personal Development by Celia Hunt and Fiona Sampson (Jessica Kingsley, 2000)
To Travel Hopefully by Christopher Rush (Profile, 2005)

Further along

Poetry, Therapy and Emotional Life by Diana Hedges (Radcliffe, 2005)

Communities, groups and organisations

Reflections on Therapeutic Storymaking by Alida Gersie (Jessica Kingsley 1997)
Writing the Bright Moment by Roselle Angwin (Fire in the Head, 2005)
Creative Writing in Health and Social Care by Fiona Sampson (Jessica Kingsley, 2004)
Reflective Practice by Gillie Bolton (Sage, 3rd edition 2010)
The Different Drum: Community Making and Peace by M Scott Peck (Arrow, 1990)

Creative process and practical approaches

Writing Works edited by Gillie Bolton, Victoria Field and Kate Thompson (Jessica Kingsley, 2009)
Writing Cures edited by G Bolton, S Howlett, C Lago, JW Wright (Brunner-Routledge, 2004)
The Creative Process in the Individual by Thomas Troward (The Echo Library, 2007)
CG Jung on Active Imagination by CG Jung and Joan Chodorow (Routledge, 1997)

Perspecives on health, body, mind, soul

Trauma, the Body and Transformation by Kim Etherington (Jessica Kingsley, 2003)
The Listening Reader: Fiction and Poetry for Counsellors and Psychotherapists by Ben Knights (Jessica Kingsley, 1995)
Narrative Based Medicine edited by Tricia Greenhalgh & Brian Hurwitz (BMJ Books, 1998)
Care of the Soul by Thomas Moore (harper Perennial, 1992)

Values, evidence and theory

The Writing Cure by Stephen J Lepore, and Joshua M Smyth (American Psychological Association, 2002)

Working with diverse people

Edges of Everywhere by Karen Hayes (City Chameleon, 2007)
Writing Well: Creative Writing and Mental Health by Deborah Philips, Debra Penman & Liz Linnington (Jessica Kingsley, 1999)

From the inside

Shoot the Damn Dog by Sally Brampton (Bloomsbury, 2009)
John Clare by Himself (Fyfield, 1996) and the novel
The Quickening Maze by Adam Foulds (Jonathan Cape, 2009 )
The New Black: Mourning, Melancholia and Depression by Darian Leader (Hamish Hamilton, 2008)
Letters to a Young Poet by Rainer Maria Rilke