易发久. (2011). 天助自助者: God helps those who help themselves. 凤凰出版社.
Chicago Style (17th ed.) Citation易发久. 天助自助者: God Helps Those Who Help Themselves. 凤凰出版社, 2011.
Cita MLA易发久. 天助自助者: God Helps Those Who Help Themselves. 凤凰出版社, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.