魏桂东. (2009). 节约的都是利润: What you have saved is your profit. 石油工业出版社.
Chicago Style (17th ed.) Citation魏桂东. 节约的都是利润: What You Have Saved Is Your Profit. 石油工业出版社, 2009.
Cita MLA魏桂东. 节约的都是利润: What You Have Saved Is Your Profit. 石油工业出版社, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.