APA Style

Solorzano, H, S. (). Northstar, Building Skills for the TOEFL iBT High Intermediate . : Pearson Education, Inc, New York. 2006.

MLA Style

Solorzano, Helen, S.. "Northstar, Building Skills for the TOEFL iBT High Intermediate". : Pearson Education, Inc, New York. 2006, . BOOK.