Preamala G. Singam. (2015). Validation of the Bahasa Malaysia version of the psoriatic arthritis screening and evaluation (PASE) questionnaire and the prevalence of psoriatic arthirtis among psoriasis patients. Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Preamala G. Singam. Validation of the Bahasa Malaysia Version of the Psoriatic Arthritis Screening and Evaluation (PASE) Questionnaire and the Prevalence of Psoriatic Arthirtis Among Psoriasis Patients. Kuala Lumpur: Universiti Kebangsaan Malaysia, 2015.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Preamala G. Singam. Validation of the Bahasa Malaysia Version of the Psoriatic Arthritis Screening and Evaluation (PASE) Questionnaire and the Prevalence of Psoriatic Arthirtis Among Psoriasis Patients. Universiti Kebangsaan Malaysia, 2015.