Williams, S. W. (1966). The Chinese commercial guide: Treaties, tariffs, regulations, tables, etc., useful in the trade to China and Eastern Asia (Fifth edition.). Chengwen Pub. Co.
Lua i Stíl Chicago (17ú heag.)Williams, S. Wells. The Chinese Commercial Guide: Treaties, Tariffs, Regulations, Tables, Etc., Useful in the Trade to China and Eastern Asia. Fifth edition. Taipei, Taiwan: Chengwen Pub. Co, 1966.
Lua MLA (9ú heag.)Williams, S. Wells. The Chinese Commercial Guide: Treaties, Tariffs, Regulations, Tables, Etc., Useful in the Trade to China and Eastern Asia. Fifth edition. Chengwen Pub. Co, 1966.
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