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판 6개, 최신 판부터
MIT Press, 2004, ISBN 9780262693035
Lund Humphries, 2004, ISBN 9780853318972
MIT Press, 1983, ISBN 9780262690812
Lund Humphries, 1982, ISBN 9780853314486
Hastings House, 1970, ISBN 9780803857551
Lund Humphries, 1969, ISBN 9780853312475