Analysis of information sources in references of the Wikipedia article "Súng thần công" in Vietnamese language version.
|editorn-first= và |editorn-last= (trợ giúp)Little is known about their armament, but Chinese ships did carry bronze cannon at this time, as evidenced by the wreck of a small two-masted patrol vessel discovered in Shandong together with its anchor (inscribed 1372) and cannon (inscribed 1377).
Considering that Chinese ships armed with gunpowder weapons, including cannon, visited the region regularly from the 1200s to the 1400s
|journal= (trợ giúp)|editorn-first= và |editorn-last= (trợ giúp)|issn= (trợ giúp).|journal= (trợ giúp) (Part 4 and Part 5)