Ooi, C. P. (1992). Prolonged jaundice within first four months of life: Its aetiological factors and the validity of the investigations in discriminating extrahepatic biliary atresia from neonatal hepatitis. Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ooi, Cheong Pheng. Prolonged Jaundice Within First Four Months of Life: Its Aetiological Factors and the Validity of the Investigations in Discriminating Extrahepatic Biliary Atresia from Neonatal Hepatitis. Kuala Lumpur: Universiti Kebangsaan Malaysia, 1992.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ooi, Cheong Pheng. Prolonged Jaundice Within First Four Months of Life: Its Aetiological Factors and the Validity of the Investigations in Discriminating Extrahepatic Biliary Atresia from Neonatal Hepatitis. Universiti Kebangsaan Malaysia, 1992.