Originally published: New York: Berkley Books, 1980.

Direct Descent 2015, WordFire Press

ISBN-13: 9781614752929

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Direct Descent 2014, Blackstone Audiobooks

ISBN-13: 9781482950939

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Direct Descent 2014, Blackstone Audiobooks

ISBN-13: 9781482950922

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Direct Descent 1988, Ace Books

ISBN-13: 9780441149056

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Direct Descent 1985, Berkley Books

ISBN-13: 9780425081860

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Direct Descent 1983, Ace Books

ISBN-13: 9780441149049

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Direct Descent 1982, New English Library Ltd, Sevenoaks

ISBN-13: 9780450054068

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Direct Descent 1981, Ace Books

ISBN-13: 9780441149032

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Direct Descent 1980, Ace Books, New York, NY

ISBN-13: 9780441148974

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