CAMPBELL, M. (1989). Satu, dua, tiga [1-2-3] Release 3: The Complete Reference/mary Campbell. Osborne McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)CAMPBELL, Mary. Satu, Dua, Tiga [1-2-3] Release 3: The Complete Reference/mary Campbell. Osborne McGraw-Hill, 1989.
Lua MLA (8ú heag.)CAMPBELL, Mary. Satu, Dua, Tiga [1-2-3] Release 3: The Complete Reference/mary Campbell. Osborne McGraw-Hill, 1989.
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