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My bibtex style outputs

Newton, S. I. Opticks, or a treatise of the reflections, refractions, inflections and colours of light [Text] / Sir Isaac Newton. [S. l.], 1730. 382 p. Google Books : XXu4AkRVBBoC.

for the following BibTeX entry

author = {Newton, Sir Isaac},
title = {Opticks, or a treatise of the reflections,
refractions, inflections and colours of light},
publisher = {William Innys},
url = {http://books.google.com/books?id=XXu4AkRVBBoC},
year = {1730},
numpages = {382},
eprint = {XXu4AkRVBBoC},
eprinttype = {Google Books},

How should I change the field

author = {Newton, Sir Isaac},

obtain someting reasonable rather than Newton, S. I.. Note that second occurence of Newton's name (Sir Isaak Newton) is correct.

What would be correct to say: Sir Isaak or Sir Newton?

share|improve this question
In references you do not need to refer to a persons qualifications nor titles. So I would not add it. If you really want it you can escape the sir by adding it in a group {Sir} or {\relax Sir}. See: tex.stackexchange.com/questions/26332/… – zeroth Feb 1 '12 at 16:34
The Sir belongs to the first name. So it would be Sir Isaac or Sir Isaac Newton, but never Sir Newton. More info and references can be found on en.wikipedia.org/wiki/Sir. – Andy Feb 1 '12 at 16:38
up vote 13 down vote accepted

The following form of the author field will work even if your bibliography style is set to abbreviate first names down to their initials:

author = "{\relax Sir I}saac Newton",
share|improve this answer
Don't you need {\relax Sir I}saac Newton (which is still simpler than my answer), otherwise abbrv style at least treats the whole brace group as a letter so you get Sir Isaac. with a full stop after the full name, – David Carlisle Feb 1 '12 at 17:14
You're right! I'll make the change right away. (I had only tested out my answer with a .bst file that abbreviates first names without adding a period (emm, full stop). – Mico Feb 1 '12 at 18:03

The title Sir is always used with the first name so never Sir Newton. usually titles are omitted from bilbliographies I think, but if you want {Sir Isaac} to be get the initial I possibly the simplest is to hide the Sir part in a macro so mark it up as something like {\Sir I}saac with \Sir defined to put Sir back on full names and do nothing if just given I (or leave it as Sir I., which is simper).

This has been edited to get the BibTeX braces more correct, it seems to work as given if \Sir defined simply as \newcommand\Sir{Sir }

share|improve this answer
I assume that bibtex DB should be self consistent. That's why I prefer Mico's answer. – Igor Kotelnikov Feb 1 '12 at 17:28
As I said in my comment to Mico;s answer, using \relax is simpler (but I think the brace placement needs adjusting) – David Carlisle Feb 1 '12 at 17:35

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