Dirk Gently's Holistic Detective Agency:  Simon & Schuster, 1987.

The Long Dark Tea-Time of the Soul:  Heinemann, 1988 and Simon & Schuster,  1989.

The two novels also appear in one volume:

Two Complete Novels (Dirk Gently's Holistic Detective Agency and The Long Dark Tea-Time of the Soul):  Wings Books, 1994.

Dirk Gently's Holistic Detective Agency: Two Complete Novels: Random House, 1995

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