Adjusting the space between references in the bibliography.
If you use LaTeX and want to adjust the spacing between each item in your bibliography, then download bibspacing.sty and put the following in your document:
Change the spacing to whatever you desire of course. This works even if you use BibTeX.
Alternately, if you don’t want to download bibspacing.sty, you can just include it’s contents into the preamble of your LaTeX source:
This method also works if you use BibTeX.
This was adapted from here. See an alternate approach here.
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It's possible to include references in ShareLaTeX using all major bibliographies management programs: biblatex, natbib and bibtex. This article explains how to create a .bib bibliography database file from scratch, how to upload and existing one and how to create one from a template.
 Creating your bibliography database
To create a new bibliography file in ShareLaTeX, in the editor, click New File icon .
an input box will appear for you to set the name of the new file. The file should have the .bib extension, in this example is called "mybibliography.bib"; now click on Create.
A new file will be listed in the left panel, click it to edit its contents. Add your bibliography entries there.
Now you can import this .bib file in the main .tex file. See the next example
The command adds the created bibliography file to the document so you can use those references. See Bibliography management in LaTeX for more information about bibliography management.
 Uploading your bibliography database
If you already have a bibliography file that you need to use in a ShareLaTeX project, you can upload it. Click the Upload icon on top of the the left panel.
A dialogue box will appear, you can either drag and drop the .bib file or click Select file(s) to navigate to the location of your file.
Once the upload process is finished you can include the .bib file in your main .tex document. See the last example in the previous section.
 Using a template
ShareLaTeX provides a vast set of templates for almost all kind of LaTeX documents, they include several bibliography-related ones.
If you are in the editor view, click the "Back to projects" icon to go to the Projects view.
In the the Project Management view click the button New Project, then in the drop-down menu that will appear click Bibliographies.
You will be redirected to a list of bibliography templates
click the one you prefer, in the next page click Open in ShareLaTeX:
The template will open in the ShareLaTeX editor so you can start working on it.
 Quick guides
- Creating a bibliography file from scratch. In editor, on the upper left corner click the New file icon then enter the name for your new file with extension .bib and click Create. You can now start editing you file.
- Uploading your bibliography database. To upload an existing .bib file click the Upload icon . Drag and drop your file in the dialogue box and wait for your file(s) to be uploaded. After that you can use your .bib within the document.
- Using a template. In the Project Management page click New Project => Bibliographies you will be redirected to the Templates page, select the one you need and then click Open in ShareLaTeX
 Supported bibliography packages
For more information about bibliography management in LaTeX see.