Box office: 'Paranormal Activity' spinoff scares up ticket sales - Los Angeles Times
Paranormal Activity film scares off box office rivals - BBC News
The Ultimate Paranormal Activity Collection (DVD) - Walmart.com
MOVIECLIPS - In honor of 'Paranormal Activity 2's' release ten years ago, we're taking a look back at the box office for the entire 'Paranormal Activity' franchise. Which one do you think
Box office results: 'Paranormal Activity 3' sets October record