yes yes, it is Wikipedia, but there are a lot of sources in the bibliography.
Wich means it isn't a source by itself.
At best the notes and references give a hint of real sources. Wikipedia isn't a reliable secondary or tertiary source.
There are even differences in the Wikipedia articles on a topic in different language versions of the same article.
Neither is anything available for free on the internet... especially nothing that has "worldoftanks" in its URL. The Internet is at best a quick reference or reminder IF you know what you are looking for and have a good base knowledge of the topic.
Books written by Spielberger and/or Hilary L. Doyle are very good sources. Very detailed and technical though... so an engineering degree would be helpfull as well.
Uwe Feist, Bruce Culver and Thomas L. Jentz also wrote good books on the Panther tank.
Wikipedia quotes all of these authors as reference BUT without having read the books its impossible to tell if they quoted right and what the full context of the quote is. Its even possible that they just claim quotes to give credibility to stuff somebody made up. Without having read the primary or secondary source you will never know.
P.S.: Just in case it isn't clear I claim works of all of the above mentioned authors as sources... go to your bookshelf crossread them and tell the page where I got it wrong.