Article in a multivolume work:
To indicate a specific article in a multivolume work, provide the author's name and the title of the article in quotation marks. Not the page numbers for the article after the date of publication:
Angermuller, Rudolf. "Salieri, Antonio." The New Grove Dictionary of Music and Musicians. Vol. 16. New York: Macmillan, 1980. 415-420. Print.
The Grove Dictionary of Music and Musicians is an encyclopaedic dictionary of music and musicians and is one of the largest single reference works on Western music. An entry from this work would make an excellent choice for one of your three required sources! It is located in the Rome Reference shelves under the call number:
Unfortunately, we do not have a set of these in the Cartersville library, but if you contact us (using any of the options on the Get Help tab) we'll be more than happy to send a copy of the entry you need through email.