How do I cite a website within text using APA formatting? this is the website: http://www.rtinetwork.org/
Your in-text citation must always lead back to your source in your reference list. Therefore, if you are using a corporate author or group author, (i.e. an organization) and you list it in your reference citation as RTI Action Network, then your in-text citation should match - (RTI Action Network, 2012).
For examples of in-text citations, including corporate authors, see this CSS Library page - http://libguides.css.edu/content.php?pid=61826&sid=454619