Your sources for the 2nd paper may be more complicated than your sources for the first paper. In addition to the APA style resources I pointed you toward earlier in the semester, here is another site that may help you figure out, for example, how to cite an authorless blog.
These are the supplementary materials referred to by Rigoni et al. (2011). You may be particularly interested in the two versions of the passage from Crick's "The Astonishing Hypothesis" that participants read.
Definitely read this; I think you'll find it very useful!
This page distinguishes the SAM pathway (system) from the HPA axis, including a somewhat helpful video on the HPA axis (although it sounds a bit like one of those monotone animations done on xtranormal.com):