Xian, Xiaowei; Zhang, Linyuan; Ai, Nanshan; Wihelm, Wohlke (1. marec 1991). »On the relation between the evolution of natural environment and human factors and the development of urban settlement—Take the Lanzhou Valley Basin as an examples«. Chinese Geographical Science. 1 (1): 42–53. doi:10.1007/BF02664455. S2CID195214733.
"The Earthquake," E. J. Mann in Links with China and Other Lands, No. 31, April 1921, Lanzhou: China Inland Mission (quarterly) Bound volume in MS 380302, Papers of Ebenezer and Mabel Mann, SOAS, 331.[1]Arhivirano October 11, 2013, na Wayback Machine.
Xian, Xiaowei; Zhang, Linyuan; Ai, Nanshan; Wihelm, Wohlke (1. marec 1991). »On the relation between the evolution of natural environment and human factors and the development of urban settlement—Take the Lanzhou Valley Basin as an examples«. Chinese Geographical Science. 1 (1): 42–53. doi:10.1007/BF02664455. S2CID195214733.
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财经自媒体 (26. maj 2021). »人口增加74万 兰州离"强省会"还有多远？«. finance.sina.com.cn. Pridobljeno 9. junija 2021.
"The Earthquake," E. J. Mann in Links with China and Other Lands, No. 31, April 1921, Lanzhou: China Inland Mission (quarterly) Bound volume in MS 380302, Papers of Ebenezer and Mabel Mann, SOAS, 331.[1]Arhivirano October 11, 2013, na Wayback Machine.
