The In-Text or Parenthetical citation for most sources will be ([the author's last name] [page number]). See the examples below.
The In-text citation would be (Blendon 172) the 172 reflects the page where my information was found.
The In-text citation would be (Marty 423)
The In-text citation would be (Puerto Rico Residents). This article does not have an author, so you will use the title. In addition, there are no page numbers for this source because it is an audio recording, so you will leave that out.
The In-text citation would be (Thebault). This article does not have page numbers, so you would leave that out.