Spira, A. P., Beaudreau, S. A., Stone, K. L., Kezirian, E. J., Lui, L., Redline, S., . . . Stewart, A. (2012). Reliability and Validity of the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale in Older Men. Oxford University Press.

Spira, Adam P., Sherry A. Beaudreau, Katie L. Stone, Eric J. Kezirian, Li-Yung Lui, Susan Redline, Sonia Ancoli-Israel, Kristine Ensrud, and Anita Stewart. Reliability and Validity of the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale in Older Men. Oxford University Press, 2012.

Spira, Adam P., et al. Reliability and Validity of the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale in Older Men. Oxford University Press, 2012.