Estupigan, R. (1997). Secrets of effective study habits. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Estupigan, Ruth. "Secrets of Effective Study Habits." Manila Bulletin 1997.
Lua MLA (9ú heag.)Estupigan, Ruth. "Secrets of Effective Study Habits." Manila Bulletin, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.