\
include
d file (i.e., despite the
package’s name, the availability of bibliographies is related to the
component source files of the document rather than to the chapters that
logically structure the document).
The package bibunits ties bibliographies to logical units
within the document: the package will deal with chapters and sections
(as defined by LaTeX itself) and also defines a bibunit
environment so that users can select their own structuring.
This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=chapbib