Khoo-Ong, P. Y. (1986). Locus of control, self-concept, past performance and socio-economic status in relation to the academic achievement of Singapore Technical College students.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Khoo-Ong, Pee Ying. Locus of Control, Self-concept, Past Performance and Socio-economic Status in Relation to the Academic Achievement of Singapore Technical College Students. 1986.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Khoo-Ong, Pee Ying. Locus of Control, Self-concept, Past Performance and Socio-economic Status in Relation to the Academic Achievement of Singapore Technical College Students. 1986.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.