Qiu, C., Gelaye, B., Zhong, Q., Enquobahrie, D. A., Frederick, I. O., & Williams, M. A. (2016). Construct Validity and Factor Structure of the Pittsburgh Sleep Quality Index among Pregnant Women in a Pacific-Northwest Cohort. Sleep Breath.

Qiu, Chunfang, Bizu Gelaye, Qiu-Yue Zhong, Daniel A. Enquobahrie, Ihunnaya O. Frederick, e Michelle A. Williams. "Construct Validity and Factor Structure of the Pittsburgh Sleep Quality Index Among Pregnant Women in a Pacific-Northwest Cohort." Sleep Breath 2016.

Qiu, Chunfang, et al. "Construct Validity and Factor Structure of the Pittsburgh Sleep Quality Index Among Pregnant Women in a Pacific-Northwest Cohort." Sleep Breath 2016.