Wang et al. 2023, p. 11. Wang, Xingxing; Li, Gang; Wang, Shuo; Feng, Chenxi; Xu, Wei; Nie, Qifan; Liu, Qian (June 2023). "The effect of environmental changes on locust outbreak dynamics in the downstream area of the Yellow River during the Ming and Qing Dynasties". Science of the Total Environment. 877: 162921. Bibcode:2023ScTEn.877p2921W. doi:10.1016/j.scitotenv.2023.162921. PMID36933725. S2CID257592636.
Simpson 2020, p. 23. Simpson, John (2020). "Naked-eye sunspot observations: a critical review of pre-telescopic western reports". Journal of the British Astronomical Association. 130 (1): 15. Bibcode:2020JBAA..130...15S – via EBSCO.
Wang et al. 2023, p. 11. Wang, Xingxing; Li, Gang; Wang, Shuo; Feng, Chenxi; Xu, Wei; Nie, Qifan; Liu, Qian (June 2023). "The effect of environmental changes on locust outbreak dynamics in the downstream area of the Yellow River during the Ming and Qing Dynasties". Science of the Total Environment. 877: 162921. Bibcode:2023ScTEn.877p2921W. doi:10.1016/j.scitotenv.2023.162921. PMID36933725. S2CID257592636.
Wang et al. 2023, p. 11. Wang, Xingxing; Li, Gang; Wang, Shuo; Feng, Chenxi; Xu, Wei; Nie, Qifan; Liu, Qian (June 2023). "The effect of environmental changes on locust outbreak dynamics in the downstream area of the Yellow River during the Ming and Qing Dynasties". Science of the Total Environment. 877: 162921. Bibcode:2023ScTEn.877p2921W. doi:10.1016/j.scitotenv.2023.162921. PMID36933725. S2CID257592636.
Wang et al. 2023, p. 11. Wang, Xingxing; Li, Gang; Wang, Shuo; Feng, Chenxi; Xu, Wei; Nie, Qifan; Liu, Qian (June 2023). "The effect of environmental changes on locust outbreak dynamics in the downstream area of the Yellow River during the Ming and Qing Dynasties". Science of the Total Environment. 877: 162921. Bibcode:2023ScTEn.877p2921W. doi:10.1016/j.scitotenv.2023.162921. PMID36933725. S2CID257592636.