International politics balance of power, balance of productivity, balance of ideologies by RalphPettman Paperback, 264 Pages, Published 1991 by Longman ISBN-13: 978-0-582-86899-1, ISBN: 0-582-86899-8
International Politics Balance of Power, Balance of Productivity, Balance of Ideologies by RalphPettman Paperback, 252 Pages, Published 1991 by Longman Cheshire ISBN-13: 978-1-55587-281-6, ISBN: 1-55587-281-6