Co, I. K. D., & Tamayo, J. P. D. (2012). Application of the importance-performance model in determining male and female tour guides service quality. UP Asian Institute of Tourism.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Co, Ira Keziah D., و 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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Co, Ira Keziah D., و Joyce Patricia D. Tamayo. Application of the Importance-performance Model in Determining Male and Female Tour Guides Service Quality. UP Asian Institute of Tourism, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.