New Economics Foundation (1998) Participation works: 21 techniques, New Economics Foundation

O’Connor, DM (1994) Constructive citizen participation: a resource book, Connor Development Services, fifth edition, Victoria, BC

Owen, H (1997) Expanding our now: the story of open space technology, Berrett-Koehler, San Francisco

Owen, H (1997) Open space technology: a users’ guide, Berrett-Koehler, San Francisco

See also this list of Open Space Technology website references