natbib, inbook, and references format

[knubee]

I am using the natbib package to format my citations and
references. So far, everything is mostly fine. There are two problems:
one is related to using an "inbook" citation -- and the other is with
the formatting of the references section.

I am using latex2e with the following:

\usepackage{natbib}
\bibliographystyle{plainnat}
\bibliography{my-bib}

Example:

@InBook{someauthor1980,
author = {An Author},
editor = {Joe Editor},
title = {A book},
chapter = {The chapter title},
pages = {61--77}
}

(Yes, I have intentionally left out the information for other fields
for this example)

Here is the result I get:

An Author. {\em The chapter title}, chapter A book, pages 61--77.

Here is what I want/expect:

An Author. The chapter title. In: Editor, Joe (ed.) A book, pages
61--77.

Differences: no italics; use word "In:"; not complain about "can't have
both an editor and an author for a book"; etc.

Note: I am not asking about "customizing" a Harvard format -- my
desired format is one of the standards. So, I am assuming there is
some setting that I do not know about -- or some aspect of my "inbook"
code that I have wrong. Perhaps I need to add some
option in the package statement -- or even add a sub-package
statement? If so, examples would be appreciated.

The other problem is related. The default format generated for the
References
listing is:

An Author. {\em The chapter title}, chapter A book, pages 61--77.

Is there a straight-forward way to change this to:

Author, An. The chapter title, chapter A book, pages 61--77.

(still want the sort-order to be alphabetical by last name)

I know I can go in and do this by hand, but would rather not.

Any suggestions or pointers to more detailed information about these
issues as they relate to natbib much appreciated.