Arba'at Hassan. (1992). The perceptions of grade 6 school teachers regarding the status of Alam dan Manusia (Man and environment) in the primary school curriculum in Sabah, Malaysia. Southern Illinois University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Arba'at Hassan. The Perceptions of Grade 6 School Teachers Regarding the Status of Alam Dan Manusia (Man and Environment) in the Primary School Curriculum in Sabah, Malaysia. Carbonale, Ill: Southern Illinois University, 1992.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Arba'at Hassan. The Perceptions of Grade 6 School Teachers Regarding the Status of Alam Dan Manusia (Man and Environment) in the Primary School Curriculum in Sabah, Malaysia. Southern Illinois University, 1992.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.