APA

http://content.easybib.com/guides/citation-guides/apa-format/

Chicago

http://www.chicagomanualofstyle.org/tools_citationguide.html

MLA

http://content.easybib.com/guides/citation-guides/mla-format/

IEEE

https://www.ieee.org/publications_standards/publications/authors/author_templates.html

Harvard Referencing

https://www.citethisforme.com/harvard-referencing

Vancouver Referencing especially for subject Medicine/ Medical

http://library.vcc.ca/downloads/VCC_VancouverStyleGuide.pdf

MHRA Referencing

http://www.mhra.org.uk/Publications/Books/StyleGuide/quickstyleguide.html

OSCOLA Referencing

https://www.law.ox.ac.uk/research-subject-groups/publications/oscola

Mendeley

It is a free reference manager and academic social network. Make your own fully-searchable library in seconds, cite as you write, and read and annotate your PDFs on any device. Showcase your work and assess the impact of your research

https://www.mendeley.com/

Endnote

Completely free, online basic reference manager – perfect for writing that first research paper

http://endnote.com/

Zetero

Zotero is a veteran and completely free browser based plugin that helps you collect, organize, cite, and share your research sources. This tool lives right where you do your work; in the web browser itself. Whether you need to create footnotes, endnotes, in-text citations, or bibliographies, Zotero will do all the dirty work for you, leaving you free to focus on your writing. Create citations in Word and OpenOffice without ever leaving your word processor and add references to an email, a Google Doc, or some other editor simply by dragging one or more references out of Zotero. The only disadvantage? Zotero doesn’t allow you to annotate a PDF document.

https://www.zotero.org/

RefWorks

RefWorks is an online citation manager. One can use it to create an online list of references from your searches, to insert or paste citations into a document and to insert or produce a bibliography in a selection of styles

http://www.proquest.com/products-services/refworks.html

 for trial version

Cite This For Me

It helps to create your citations, reference lists and bibliographies automatically using the APA, MLA, Chicago, or Harvard referencing styles at the click of button. Simply browse to the page you wish to cite and click the button to generate a correctly formatted citation. Then copy-paste the citation into your assignment, or add it to your online bibliography for safe keeping until later. Cite This For Me also comes with a Google Chrome extension.

https://www.citethisforme.com/

RefMe

Helps to create your bibliography over 7,500 reference styles, including Harvard, APA and MLA, etc

https://www.refme.com/

EasyBib

A great citation generator, EasyBib compiles your bibliographies and citations for you, saving you valuable time. You don’t need to create an account if you are using MLA, but Chicago or APA style citations require a paid account. EasyBib also offers an app for iOS and Android, so you can cite your sources on the go.

http://www.easybib.com/

Citavi

A reference manager, knowledge organization, and task planning program for Windows, published in Switzerland. The free version is limited to 100 references per project, so it is ideal for students. Is also integrates with Chrome and Word.

https://www.citavi.com/en/index.html

Citefast

Cite your work at APA, MLA, and Chicago without leaving the homepage in 3 easy steps. The fourth step allows you to download your bibliography; you can even save it if you create an account. Your citations will be kept as long as you keep visiting the site, but after four days of inactivity your citations will be deleted.

http://www.citefast.com/

Docear

An open source reference manager that is available for Windows, Mac, and Linux, and offers PDF metadata retrieval, free online backup of your mind maps, a monitoring function for new files (PDFs, images, etc.), and an MS-Word add on. Oh, and it also allows you to have full control over your data (no registration required).

http://www.docear.org/