APA format for Pages app

I just bought my new iPad the other day and so far I am loving it. One of the things I will be using this for is school. I want to download the Pages app and I had a question about the formatting templates on there before I spend $10 bucks. I have to write APA style papers for my classes and I see that you can download formats for writing papers in the various formats (MLA, APA, etc.). Do these formats come pre-loaded in the pages app or do you have to actually download them? And if you have to download them will I be able to do that on the iPad? Thanks for the help.