BSD/SunOS Reference

[Pabbisetty.Henr at xerox.com]

I am familiar with the following book explaining the "internals" of System V UNIX:

Maurice J. Bach
    The Design of the UNIX Operating System
    Prentice-Hall
    

Is there a publication (BSD/Sun Internal reports OR otherwise) that expalins the
other versions of UNIX at least half as well as the aforementioned book for AT&T?

Any references in this regard will be apprciated...

- nagesh