Conflicting Sources?

I'm rolling along with John Dunn, Heart of a Zulu, and I am finding a bunch of conflicting information in these different books and internet sites. Some describe real people in one way, and other sources in another way. Some say this about a battle, but other sources say that about the same battle.

And don't even mention spelling. Uh oh, I mentioned it. When it comes to Zulu words, not one of the four books I have is consistent with another. It seems that every different source, online sites included, have their own way of spelling every single Zulu word!

I've counted up to four different ways Cetshwayo is spelled. At least John Dunn is the same everywhere, but it's all different with everything Zulu.

So I'm going with what works. As long as my book is consistent with itself, that's what matters. So for instance, Cetshwayo will be spelled like that every time. Same with every other Zulu word.

And when it comes to the events, which are also different in every book, well, hey, it's a historical NOVEL, so that one's going to be my call.