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Lua i Stíl Chicago (17ú heag.)Co, Ira Keziah D., agus Joyce Patricia D. Tamayo. Application of the Importance-performance Model in Determining Male and Female Tour Guides Service Quality. Quezon City: UP Asian Institute of Tourism, 2012.
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Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.