Li, Y., Li, Z., Lei, F., Du, L., & Tang, X. (2013). Persistent Insomnia Despite Long-Term Nightly Use of Sleeping Pills. American Academy of Sleep Medicine.
استشهاد بنمط شيكاغوLi, Yun, Zhe Li, Fei Lei, Lina Du, و Xiangdong Tang. Persistent Insomnia Despite Long-Term Nightly Use of Sleeping Pills. American Academy of Sleep Medicine, 2013.
MLA استشهادLi, Yun, et al. Persistent Insomnia Despite Long-Term Nightly Use of Sleeping Pills. American Academy of Sleep Medicine, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.