Ab. Azizal Safi Haji Ismail. (1990). A study of knowledge, attitudes and practices on typhoid among secondary school students in Tumpat District, Kelantan.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ab. Azizal Safi Haji Ismail. A Study of Knowledge, Attitudes and Practices on Typhoid Among Secondary School Students in Tumpat District, Kelantan. 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ab. Azizal Safi Haji Ismail. A Study of Knowledge, Attitudes and Practices on Typhoid Among Secondary School Students in Tumpat District, Kelantan. 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.