You need research articles that explain the mechanism behind the stroop effect. For example, the topic of automatic processing in the stroop effect would be a good paper.
Specifically relating to the Number/Numeric Stroop experiment (or colorful)
The articles must be research based not clinical studies
Cited information must come from scholarly journal articles (literary review)
(if possible please send me an article link that you are using to write the paper so i can double check with my instructor to see if eligible)