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Lua i Stíl Chicago (17ú heag.)Harvard Business Review. Happiness. Boston, U.S: HBSP, 2017.
Lua MLA (9ú heag.)Harvard Business Review. Happiness. HBSP, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.