Proper Works Cited Page for APA style:

Label the page References centered at the top. Double space the entire list. Every line after the first line of a citation should be indented one-half inch from the left margin (also known as hanging indentations). Alphabetize your entire bibliography list. This should be a page all by itself!

References

Cotton Gin. (n.d.). Retrieved from

http://www.archives.gov/education/lessons/cotton-gin-patent/

Cotton Gin. (n.d.). Retrieved from http://www.ourdocuments.gov/doc.php?flash=true&doc=14

Eli Whitney. (n.d.). Retrieved from http://www.eliwhitney.org/sites/default/files/minisites/cotton/patent.html

 Helpful resource for APA citations on the Reference page: https://owl.english.purdue.edu/owl/resource/560/10/