APA Style
Sanabria, K., Ferree, T. (2004).
Northstar: listening and speaking, high intermediate audio CDs .
[s.l.]:
Pearson Education.
MLA Style
Sanabria, Kim., Ferree, Tess.
"Northstar: listening and speaking, high intermediate audio CDs".
[s.l.]:
Pearson Education,
2004.
Audio CD.