Not sure if this is the right place for this but here goes. I was looking up info on Yongye International (YONG). I looked at three different quotes and got 3 drastically different P/E ratios.

Fool - 14.12
Yahoo - 174.32
My broker - 42.61

What gives? I'm assuming all 3 can calculate a simple ratio. So why are they using different data? Which one should I believe? Is there no standard for the time period used? Anyone care to take a guess as to why they are so different?