Kelleher, A., & Klein, L. F. (2011). Global perspectives (4th ed.). Longman.
Lua i Stíl Chicago (17ú heag.)Kelleher, Ann, agus Laura F. Klein. Global Perspectives. 4th ed. Boston: Longman, 2011.
Lua MLA (9ú heag.)Kelleher, Ann, agus Laura F. Klein. Global Perspectives. 4th ed. Longman, 2011.
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