Citação norma APA

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.

Citação norma Chicago

Lemma, Seblewngel, Bizu Gelaye, Yemane Berhane, Alemayehu Worku, and Michelle A. Williams. Sleep Quality and Its Psychological Correlates Among University Students in Ethiopia: A Cross-sectional Study. BioMed Central, 2012.

Citação norma MLA

Lemma, Seblewngel, et al. Sleep Quality and Its Psychological Correlates Among University Students in Ethiopia: A Cross-sectional Study. BioMed Central, 2012.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.