Zulkefli Hussein. (1996). The Prevalence of anaerobic infections in head and neck infections among patients admitted to ear, nose and throat wards hospital Kuala Lumpur from September 1994 to September 1995. Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Zulkefli Hussein. The Prevalence of Anaerobic Infections in Head and Neck Infections Among Patients Admitted to Ear, Nose and Throat Wards Hospital Kuala Lumpur from September 1994 to September 1995. Kuala Lumpur: Universiti Kebangsaan Malaysia, 1996.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Zulkefli Hussein. The Prevalence of Anaerobic Infections in Head and Neck Infections Among Patients Admitted to Ear, Nose and Throat Wards Hospital Kuala Lumpur from September 1994 to September 1995. Universiti Kebangsaan Malaysia, 1996.