Ong, P. K. (1990). Guidance needs as perceived by lower secondary pupils and their teachers.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ong, Phiak Kim. Guidance Needs as Perceived by Lower Secondary Pupils and Their Teachers. 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ong, Phiak Kim. Guidance Needs as Perceived by Lower Secondary Pupils and Their Teachers. 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.