توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

De Guzman, P. E., & Robles, K. C. (2006). The role of contractual employment in the business firms and impact on the employees. University of the Philippines Diliman Extension Program in Pampanga.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

De Guzman, Priscilla E., و Kathyrine C. Robles. The Role of Contractual Employment in the Business Firms and Impact on the Employees. Pampanga: University of the Philippines Diliman Extension Program in Pampanga, 2006.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

De Guzman, Priscilla E., و Kathyrine C. Robles. The Role of Contractual Employment in the Business Firms and Impact on the Employees. University of the Philippines Diliman Extension Program in Pampanga, 2006.