유니언 퍼시픽 철도
위키백과, 우리 모두의 백과사전.
- Union Pacific Railroad. “UP: Executive Profiles - James R. Young, President and Chief Executive Officer”. 2007-01-31에 확인함.
- “Union Pacific Railroad Company - 2005” (PDF). Association of American Railroads. 2008-01-17에 확인함.
- “Railroad Industry Profiles”. Association of American Railroads. 2008. 2008-01-17에 확인함.