Well it makes no difference but i can't find enough details on wikipedia, f.e about Supercruising with the Gripen-E wikipedia or Saab only mention the engines itself a little bit, so no "ww.f35.com" to follow there, that is my problem.
Enter the address into your browser. The page exists. It seems to be Lockheed Martin's official page for the jet. Your teachers surely won't blame you for using information from that page, even if you've gotten the link from Wikipedia.
It is very likely the policy is meant to prevent lazy students from copying text from Wikipedia, not from using the sources mentioned there.