Following our tradition from 2010 and 2011, we present you an overview of the aspects of APA style that students find the most difficult. The data was collected from the manuscripts submitted to us in 2012. Just as in the previous two posts, we were more interested in the type of mistakes that students do, rather than their quantity. In this year’s analysis, more categories have been included compared with the previous two (27 in total), which allowed us to conduct a more detailed investigation on common APA style mistakes. This was done by identifying the mistake categories with the highest frequencies from the papers submitted to us. This post will guide you through the most common APA style mistakes and offer you advice on how to avoid them when writing your own paper. We will start off with the general formatting of the paper; then, we will move on to citing sources and formatting the reference list.