What is in-text citation (APA style)?
Here are a few rules for when to cite: If the information is common knowledge, you do not have to cite the information. However, if you are researching and use information you found, you have to cite the source. The same is true with a quote or paraphrasing. You even have to cite personal experience. The actual in-text citation varies in format – usually the author’s name and the year – like this: (Example, 2008). Put it after you insert the material or at the end of the paragraph, whichever come first. Make sure your sentence punctuation comes after the parenthesis. If you need more information, try this website from Purdue University: http://owl.english.purdue.
If one plans on writing many papers and using citations, a program that is very useful is calle APA PERRLA http://www.perrla.com/Pages/1/2.aspx The other responses are correct as far as where to insert the citation, ie whenever the information did not come from your own head. Note: This also includes info you received verbally, from other people.