APA Style
Ferree, R., Sanabria, K. (2004).
Northstar: listening and speaking, high intermediate .
[s.l.]:
Pearson Education.
MLA Style
Ferree, Ress., Sanabria, Kim.
"Northstar: listening and speaking, high intermediate".
[s.l.]:
Pearson Education,
2004.
Book + Audio CD.