《梁書·諸夷列傳》:扶桑國者,齊永元元年,其國有沙門慧深來至荊州,说云:“扶桑在大漢國東二萬餘里……” Joseph Needham; Ling Wang; Gwei-Djen. Pt. 3, Civil engineering and nautics. Science and civilisation in China
ISBN 978-0-12-508380-5. 含有內容需登入查看的頁面 (link) Needham, Joseph; Lu, Gwei-djen; Huang, Hsing-Tsung. Science and Civilisation in China, Vol. 6 Part 1 Botany