Coba jelasin Catatan dari Huan Tan dalam bahasa melayu dong

Crespigny, Rafe de. (2007). A Biographical Dictionary of Later Han to the Three Kingdoms (23-220 AD). Leiden: Koninklijke Brill. ISBN 90-04-15605-4.

Needham, Joseph (1986). Science and Civilization in China: Volume 4, Physics and Physical Technology, Part 2, Mechanical Engineering. Taipei: Caves Books Ltd.