What does this Works Cited entry indicate about the cited work?
Hille, Karl, Ed. "A Hubble Sweep of the Dust Filaments of NGC 4217." Hubble. NASA, 27 Jan. 2015. Web. 1 May 2015.

 - Hubble is the title of the web page.
 - "A Hubble Sweep of the Dust Filaments of NGC 4217" is the title of the web page.
 - NASA is the title of the web page.
Look closely at the Works Cited entry:
Hille, Karl, Ed. "A Hubble Sweep of the Dust Filaments of NGC 4217." Hubble. NASA, 27 Jan. 2015. Web. 1 May 2015.
You can tell that "A Hubble Sweep of the Dust Filaments of NGC 4217" is the title of the web page because it appears in quotation marks.