This is a brief list of sources on the internet and print that decode or index journal abbreviations or list sources that decode such abbreviations.

Journal Title Abbreviations: http://www.wsulibs.wsu.edu/general/journal_abbreviations.html

AGRICOLA List of Journals Indexed: http://www.nal.usda.gov/catalog/jia.shtml

BioABACUS: http://www.nmsu.edu/~molbio/bioABACUShome.htm

Biological Journals And Abbreviations: http://home.ncifcrf.gov/research/bja/

CISTI Catalogue: http://cat.cisti.nrc.ca/search/t

Index Medicus Journal Abbreviations: ftp://nlmpubs.nlm.nih.gov/online/journals/ljiweb.pdf

ISI Journal Abbreviations Index: http://library.caltech.edu/reference/abbreviations

Mathematical Reviews' Abbreviations of Names of Serials: http://www.ams.org/mathscinet/searchjournals

NLM LocatorPlus: http://130.14.16.150/cgi-bin/Pwebrecon.cgi?DB=local&PAGE=First

All That JAS: Journal Abbreviation Sources: http://www.public.iastate.edu/~CYBERSTACKS/JAS.htm

Journal Titles and Abbreviations: http://www.library.ubc.ca/scieng/coden.html

NCBI Batch Citation Matcher: http://www.ncbi.nlm.nih.gov/entrez/citmatch_help.html#JournalLists

MEDLINE: List Of Serials Indexed: Abbreviation Listing: ftp://nlmpubs.nlm.nih.gov/online/journals/lsiweb.pdf

Core Journals Covered in CAplus: http://www.cas.org/sent.html

Journal Abbreviations and Links: http://netserv.ipc.uni-linz.ac.at/~dieter/DsWeb/Lit/0Sources.htm

Journal Abbreviations (Purdue University): http://www.lib.purdue.edu/vetmed/vmljrabbr.html

Guide to Understanding Journal Abbreviations (University of Bath):
http://www.bath.ac.uk/library/guides/abbreviations.html

Journal Abbreviation Resources on the Web: http://www.library.uiuc.edu/biotech/j-abbrev.html

Frontiers In Bioscience: http://www.bioscience.org/atlases/jourabbr/list.htm

Abbreviations of Names of Serials (Math): http://www.ams.org/msnhtml/serials.pdf

Journal of Economic Literature: Abbreviations List: http://www.aeaweb.org/journal/abbrev.html

The American Physical Society: Journal Title Abbreviations: http://authors.aps.org/STYLE/style_jabbr.html

Common Journal Abbreviations: http://tinyurl.com/vjgsz

American Journal of Archaeology: http://www.ajaonline.org/index.php?ptype=page&pid=8

Bibliographic Codes, Refereed Journal Abbreviations: http://articles.adsabs.harvard.edu/abs_doc/ref_journals.html

NCMR Library: List Of Journal Titles Abbreviations: http://atlantis.ncmr.gr/abbreva.htm

Cambridge Scientific Abstracts: Serials Source Lists: http://www.csa3.com/help/datbscoll/serials.html

Journal Title Abbreviations (Cal Tech Library): http://library.caltech.edu/reference/abbreviations/

Journal Abbreviations (Donald W. Craik Engineering Library): http://www.umanitoba.ca/libraries/units/engineering/abbrev.shtml

Yale University Science Libraries: Paper Journal Abbreviation Help:
http://www.library.yale.edu/science/help/jrnlabbrevpap.html

Journal Abbreviation Sources: http://www.public.iastate.edu/%7ECYBERSTACKS/JAS.htm

Legal Abbreviations Search: http://www.lib.latrobe.edu.au/help/subject-res/law/journal-abbreviations.php