Barton, L., Sardinas, C. D., Boyd, F., & Numrich, C. (2009). NorthStar 3: Reading and writing (3rd ed.). Longman.
Lua i Stíl Chicago (17ú heag.)Barton, Laurie, Carolyn DuPaquier Sardinas, Frances Boyd, agus Carol Numrich. NorthStar 3: Reading and Writing. 3rd ed. White Plains, NY: Longman, 2009.
Lua MLA (8ú heag.)Barton, Laurie, et al. NorthStar 3: Reading and Writing. 3rd ed. Longman, 2009.
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