Ningrum, D. (2012). A study on popular pro-social behaviour among children on selected schools of Sekolah Dasar Swasta Angkasa Halim Perdana Kusuma Jakarta, Indonesia. Institute of Education, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ningrum, Diah. A Study on Popular Pro-social Behaviour Among Children on Selected Schools of Sekolah Dasar Swasta Angkasa Halim Perdana Kusuma Jakarta, Indonesia. Kuala Lumpur: Institute of Education, International Islamic University Malaysia, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ningrum, Diah. A Study on Popular Pro-social Behaviour Among Children on Selected Schools of Sekolah Dasar Swasta Angkasa Halim Perdana Kusuma Jakarta, Indonesia. Institute of Education, International Islamic University Malaysia, 2012.