IV. Score in a series:  Use Turabian 11.16, "Book in a Series."
(Note: DO NOT underline or italicize the series title)
 

b. With series number:

Barber, Samuel.  String Quartet Op. 11.  G. Schirmer's Edition of Study Scores of Orchestral
        Works and Chamber Music, no. 28.  New York:  G. Schirmer, 1943.  Miniature Score.