Hui, C. 許. Yang Yi, 974-1020 a scholar-official in the Imperial Academy of the Northern Song Period. 北宋館閣大臣楊億(974-1020)硏究.
Čikaški stil citiranja (17. izdanje)Hui, Chun-hing. 許振興. Yang Yi, 974-1020 a Scholar-official in the Imperial Academy of the Northern Song Period. 北宋館閣大臣楊億(974-1020)硏究. [Hong Kong : Thesis (Ph.D.)--University of Hong Kong, 1990. 1989.
MLA način citiranja (8. izdanje)Hui, Chun-hing. 許振興. Yang Yi, 974-1020 a Scholar-official in the Imperial Academy of the Northern Song Period. 北宋館閣大臣楊億(974-1020)硏究.
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