แม่แบบ:R:zh:Laufer:1913
Laufer, Berthold (1913), chapter Arabic and Chinese Trade in Walrus and Narwhal Ivory, in T'oung Pao, volume 14, DOI:, pages 315–364
Laufer, Berthold (1913), chapter Arabic and Chinese Trade in Walrus and Narwhal Ivory, in T'oung Pao, volume 14, DOI:10.1163/156853213X00213, pages 315–364