You will notice with articles on this site that I will alternate between APA and MLA styles for citing works. If you need a definition of what those are exactly, there are these primers.
The reason I switch between the two has to do with the nature of the article. APA (which stands for the American Psychological Association) is commonly used for citing work within the social sciences. So when I am writing an article about culture, society, or something relevant to that, I will use APA format. MLA (which stands for Modern Language Association), is used for citing sources within the liberal arts and humanities. Therefore, when I’m discussing the themes of a movie, a book, or some form of media, I will be using MLA.
And I will always be citing sources. People should always do that.