Statistisk hypotesepröving (Statistical hypothesis testing, 1953) Gandhis politiske etikk (Gandhi's political ethics, 1955, with philosopher Arne Næss) Theory and Methods of Social Research (1967) Violence, Peace and Peace Research (1969) Members of Two Worlds (1971) Fred, vold og imperialisme (Peace, violence and imperialism, 1974) Peace: Research – Education – Action (1975) Europe in the Making (1989) Global Glasnost: Toward a New World Information and Communication Order? (1992, with Richard C. Vincent) Global Projections of Deep-Rooted U.S Pathologies (1996) Peace By Peaceful Means: Peace and Conflict, Development and Civilization (1996) Johan uten land. På fredsveien gjennom verden (Johan without land. On the Peace Path Through the World, 2000, autobiography for which he won the Brage Prize) 50 Years: 100 Peace and Conflict Perspectives (2008) Democracy – Peace – Development (2008, with Paul D. Scott) 50 Years: 25 Intellectual Landscapes Explored (2008) Globalizing God: Religion, Spirituality and Peace (2008, with Graeme MacQueen)[38]