For ScienceDirect, you may link either to the PDF or to the html version of the article. These two methods are explained in the image below.

For off-campus access, remember to add the EZproxy prefix, http://ezp.slu.edu/login?url= to the front of each URL.
For example,
http://ezp.slu.edu/login?url=http://dx.doi.org/10.1016/j.compedu.2014.05.002
http://ezp.slu.edu/login?url=http://www.sciencedirect.com/science/article/pii/S0360131514001158/pdf?md5=adda30ccca0ebbcf9a66d5678dfccece&pid=1-s2.0-S0360131514001158-main.pdf