ROBERTS, J. A. G. (1998). Modern China. An illustrated history. Sutton Publishing, Somerset, p. 71

Memorial de Zuo Zongtang, 1865, explicant les dificultats per establir a Xina unes drassanes modernes.

first, the difficulty of selecting a place for the shipyard; second, the difficulty of finding and buying steamship machinery; third, the difficulty of engaging head mechanics; fourth, the difficulty of raising and accumulating a huge amount of funds; fifth, the difficulty that the Chinese are unaccustomed to navigation and that after the completion of the ships we would still have to engage foreigners; sixth, the difficulties of the numerous requirements of expenditures for coal, salaries, and wages after the ships have been completed. Seventh, in this unusual enterprise it is easy for slander and criticism to arise. 16