A good introduction will summarize, integrate, and critically evaluate the empirical knowledge in the relevant area(s) in a way that sets the stage for your study and why you conducted it. Try to organize it in terms of the rather than who did what when.
The running head is a short title that appears at the top of pages of published articles.
It should not exceed 50 characters, including punctuation and spacing.
Don’t make one mistake typical of a novice APA-paper writer by stating overtly why you’re including a particular article (e.g., “This article is relevant to my study because…”).
It should be obvious to the reader why you’re including a reference without your explicitly saying so.
Make sure there is a one-to-one correspondence between the articles you’ve cited in your intro and the articles listed in your reference section.
Remember that your audience is the broader scientific community, not the other students in your class or your professor.
It is unnecessary to mention things such as the paper and pencil used to record the responses, the data recording sheet, the computer that ran the data analysis, the color of the computer, and so forth.
If you included a questionnaire, you should describe it in detail.
This hypothesis makes complete sense, given all the other research that was presented.” When incorporating references into your intro, you do not necessarily need to describe every single study in complete detail, particularly if different studies use similar methodologies.
Certainly you want to summarize briefly key articles, though, and point out differences in methods or findings of relevant studies when necessary.