Frazier, L., & Mills, R. Northstar: Listening and speaking (3a ed.).
Lua i Stíl Chicago (17ú heag.)Frazier, Laurice, agus Robin Mills. Northstar: Listening and Speaking. 3a ed.
Lua MLA (8ú heag.)Frazier, Laurice, agus Robin Mills. Northstar: Listening and Speaking. 3a ed.
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