>The Design and Implementation of the 4.4BSD Operating System,
>McKusick, M.K, K. Bostic, M.J. Karels, and J.S. Quarterman,
>1996, Addison-Wesley, Reading, Mass.,
>ISBN 0-201-54979-4

I think this is it.  Thanks Ken.

Since the NetBSD web page link is currently broken someone got this from
the 386BSD page, but It looks like an older edition.

>"The Design and Implementation of the 4.3BSD UNIX Operating system"
>by  Samuel J. Leffler, Marshall Kirk McKusick, Michael J. Karels, John S.
>Quarterman, 1989, Addison-Wesley, ISBN 0-201-06196-1

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