홈 / 책 찾기 / 판 고르기
판 6개, 최신 판부터
Penguin Books, 1990, ISBN 9780140137903
International Center for Creative Thinking, 1990, 양장(하드커버), ISBN 9780317905618
Penguin, 1983, ISBN 9780140224061
Penguin Books, 1979, ISBN 9780140046724
Pierrot Publishing Ltd, 1977, ISBN 9780905310060
ISBN 9780060905682
