Merdinger, P., & Barton, L. Northstar: Listening and speaking (2a ed.).
Lua i Stíl Chicago (17ú heag.)Merdinger, Polly, agus Laurie Barton. Northstar: Listening and Speaking. 2a ed.
Lua MLA (8ú heag.)Merdinger, Polly, agus Laurie Barton. Northstar: Listening and Speaking. 2a ed.
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