Useful web links: citation and style advice from journals, etc.

The Chicago Manual of Style
http://www.chicagomanualofstyle.org/contents.html

RESOURCES FOR SUBMITTING WRITING TO VARIOUS JOURNALS:

International Committee of Medical Journal Editors, Uniform requirements
for manuscripts submitted to biomedical journals: writing and publishing
for biomedical journals
http://www.icmje.org/

Nature http://www.nature.com/nature/authors/gta/index.html

PNAS http://www.pnas.org/misc/iforc.shtml

Science http://www.sciencemag.org/authors/contributing-science-family-journals

ASCE (American Society of Civil Engineers) journals
http://ascelibrary.org/page/authors

IEEE author tools
http://www.ieee.org/web/publications/authors/transjnl/index.html

ASME author resources http://journaltool.asme.org/Content/AuthorResources.cfm

OSA (Optical Society of America)
http://www.opticsinfobase.org/author/author.cfm

AGU (American Geophysical Union) http://www.agu.org/pubs/

American Mathematical Society http://www.ams.org/authors

Physical Review http://authors.aps.org/STYLE/
 
Wiley journal manuscript submission guidelines
http://www3.interscience.wiley.com/authorresources/journal-man-sub.html


A link to a very good book, The Chemistry Style Manual by Professor Kieran F Lim
http://www.deakin.edu.au/~lim/KFLim/books/Style_Manual_2004.pdf (pdf)
You can download it as a pdf file for free (see page 15 for copyright notice and permissions !!!)

Science writing advice--Yale
http://www.library.yale.edu/science/help/subject1.html

Online Version of the ACS Style Guide

http://pubs.acs.org.turing.library.northwestern.edu/isbn/9780841239999