Sidek, A., & Butterworth, M. (2009). Measurement and evaluation of the reference service of the National Library Board Singapore.
استشهاد بنمط شيكاغوSidek, Azizah, و Margaret Butterworth. Measurement and Evaluation of the Reference Service of the National Library Board Singapore. 2009.
MLA استشهادSidek, Azizah, و Margaret Butterworth. Measurement and Evaluation of the Reference Service of the National Library Board Singapore. 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.