杜佑
Following his return, he wrote his "Jingxingji" (), a work which has been almost completely lost. A few extracts survived in "Tongdian" under volume 192 and 193, an encyclopaedia compiled by his uncle, Du You (735–812). The original text was reconstructed by Chen Yunrong in 1911. In the 8th century, Du You's encyclopaedia quoted Du Huan himself on Molin (North or East Africa):