Expectations from $81

I spent $81 on a textbook for a class I'm not quite sure I need. It's a technology course that's supposed to help future teachers integrate technology and media into their lessons. I took a quick break from reading the assigned chapters because I found something so unspeakable...
I thought a book that costed $81 (used) would be credible and professional, but one of the first things it did was to cite wikipedia. That's right. A college textbook just cited wikipedia.