The Chicago Manual of Style is a very comprehensive book which describes two documentation styles, one using notes and bibliographies, the other using author-date citations and lists of references. The Chicago Manual also gives guidelines for spelling and punctuation and discusses the treatment of numbers, quotations, illustrations, tables, foreign languages, mathematical symbols, abbreviations, and so on. see http:/http: //www.fsu.edu/~library/guides/chicago.html
http://www.fsu.edu/~library/guides/citing.html
The MLA Handbook for Writers of Research Papers (1999) by Joseph Gibaldi. The MLA Handbook advises that you acknowledge sources "by keying brief parenthetical citations in your text to an alphabetical list of works that appears at the end of the paper" . Widely used by writers in literature, language studies, and other fields in the humanities, the MLA style of documentation allows writers to keep texts "as readable and as free of disruptions as possible." For a brief summary of this citation style see http://www.fsu.edu/~library/guides/mla_style.html
for a brief summary of citation style seehttp://www.isr.bucknell.edu/Research_Tools/Citation_guides/
http://www.bournemouth.ac.uk/academic_services/documents/Library/Citing_References.pdf
Scientific Style and Format: The CBE Manual for Authors, Editors, and Publishers, published by the Council of Biology Editors (now the Council of Science Editors) in 1994. Many writers in the natural sciences use the citation style recommended in the CBE Manual, which also gives advice for styling and formatting scientific papers, journals, and books for publication. Its editors offer two methods for citing and documenting sources: the citation-sequence system and the name-year system. See http://www.bedfordstmartins.com/online/cite8.html
(Thanks to Moritz)
http://www.bui.fh-hamburg.de/projekt/din1505/
http://www.ub.fu-berlin.de/service/einfuehrungen/basic/zit_linksammlung.html
http://www.uni-duesseldorf.de/ulb/zit.html
http://www.haw-hamburg.de/pers/Lorenzen/bibtex.html
(thanks to Sophie)
Guide de présentation des thèses et mémoires http://www.unice.fr/UrfistDEH/pages/Theses/normes.html
those links are about UNIMARK :
http://www.valdoise.fr/biblio/bdvo/coinbib/iso2709/p5.htm
http://rameau.bnf.fr/guide/rameau4_1.htm
http://www.oasis-open.org/cover/marc.html