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Editions

• ISBN 0-224-00888-9 (1973)
• ISBN 1-56267-113-8 (paperback, 1996)
• ISBN 0-385-33420-6 (paperback, 1999)
• ISBN 0-7953-0240-1 (e-book)
• ISBN 0-7953-0242-8 (e-book)