(美)拿破仑·希尔著. (2017). 致富的勇气 Napoleon Hill's greatest speeches ：．，. 北京联合出版公司.
Chicago Style (17th ed.) Citation(美)拿破仑·希尔著. 致富的勇气 Napoleon Hill's Greatest Speeches ：．，. 北京联合出版公司, 2017.
MLA (8th ed.) Citation(美)拿破仑·希尔著. 致富的勇气 Napoleon Hill's Greatest Speeches ：．，. 北京联合出版公司, 2017.
Warning: These citations may not always be 100% accurate.