Norhayati Mohd. Ismail. (1993). A preliminary investigation into some of the linguistic features found in two mentally retarded children in Singapore.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Norhayati Mohd. Ismail. A Preliminary Investigation into Some of the Linguistic Features Found in Two Mentally Retarded Children in Singapore. 1993.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Norhayati Mohd. Ismail. A Preliminary Investigation into Some of the Linguistic Features Found in Two Mentally Retarded Children in Singapore. 1993.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.