You should include your credentials establishing creditability at the beginning of a persuasive paper because it shows readers that you have done proper research on how to give credit to a source’s work and it also easily shows that you have proof of where you got the supporting information from when you put your credentials in the beginning of a persuasive paper, so that your readers don’t have to look throughout your whole persuasive paper to find where your credentials of establishing creditability are. I hope this helps.