What does this Works Cited entry indicate about the cited work?
Witze, Alexandra. "Race to Unravel Oklahoma's Artificial Quakes." Nature 520.7548 (2015): 418–419. Web. 27 Apr. 2015.

 - It has more than one author.
 - It was published on April 27, 2015.
 - It was accessed on April 27, 2015.
Look closely at the Works Cited entry:
Witze, Alexandra. "Race to Unravel Oklahoma's Artificial Quakes." Nature 520.7548 (2015): 418–419. Web. 27 Apr. 2015.
You can tell that the cited work was accessed on April 27, 2015, by looking at the date of access, which appears after the medium of publication.