Chen, T., & Saito, Y. (2021). Longitudinal effects of nocturnal insomnia symptom subtypes and nonrestorative sleep on the incidence of depression among community-dwelling older adults: Results from the Health and Retirement Study. Sleep Medicine, 79, 155-163. https://doi.org/10.1016/j.sleep.2021.01.003

Chen, Tuo-Yu, and Yasuhiko Saito. "Longitudinal Effects of Nocturnal Insomnia Symptom Subtypes and Nonrestorative Sleep on the Incidence of Depression Among Community-dwelling Older Adults: Results from the Health and Retirement Study." Sleep Medicine 79 (2021): 155-163. https://doi.org/10.1016/j.sleep.2021.01.003.

Chen, Tuo-Yu, and Yasuhiko Saito. "Longitudinal Effects of Nocturnal Insomnia Symptom Subtypes and Nonrestorative Sleep on the Incidence of Depression Among Community-dwelling Older Adults: Results from the Health and Retirement Study." Sleep Medicine, vol. 79, 2021, pp. 155-163, https://doi.org/10.1016/j.sleep.2021.01.003.