Solomon, C. R. (1971). Handbook of happiness. House of Solomon.
Lua i Stíl Chicago (17ú heag.)Solomon, Charles R. Handbook of Happiness. Denver: House of Solomon, 1971.
Lua MLA (9ú heag.)Solomon, Charles R. Handbook of Happiness. House of Solomon, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.