Lemma, S., Gelaye, B., Berhane, Y., Worku, A., & Williams, M. A. (2012). Sleep quality and its psychological correlates among university students in Ethiopia: A cross-sectional study. BioMed Central.
استشهاد بنمط شيكاغوLemma, Seblewngel, Bizu Gelaye, Yemane Berhane, Alemayehu Worku, و Michelle A. Williams. Sleep Quality and Its Psychological Correlates Among University Students in Ethiopia: A Cross-sectional Study. BioMed Central, 2012.
MLA استشهادLemma, Seblewngel, et al. Sleep Quality and Its Psychological Correlates Among University Students in Ethiopia: A Cross-sectional Study. BioMed Central, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.