Answered By: Stacy Williams Last Updated: Feb 23, 2017 Views: 64
In the days of typewriters, two spaces were required, and now with computers, it can be only one. This is also dependent on the style you use.
For MLA style go to: http://libguides.usc.edu/MLA
For APA style go to: http://libguides.usc.edu/APA-citation-style
For Chicago style go to: http://libguides.usc.edu/chicago_style
A great online resource for style is OWL at Purdue: https://owl.english.purdue.edu/