Procedure of writing argumentative essay

Answer 1

From Purdue Owl:

"The argumentative essay is a genre of writing that requires the student to investigate a topic, collect, generate, and evaluate evidence, and establish a position on the topic in a concise manner."

Form a thesis, show evidence that supports your claim. Basically, you argue a point.

Answer 2

Documentation guide? If you mean "How do you cite sources in an argumentative paper?" then simply follow MLA or APA format. Each is similar, but quite different in a number of ways, so be certain which is required.