Pearson Product-Moment Correlation - When you should run this test, the range of values the coefficient can take and how to measure strength of association.
Calculating Product Moment Correlation Coefficient Using Hand Calculations - YouTube
Pearson product-moment correlation
Correlation and autocorrelation > Pearson (Product moment) correlation
12: Pearson R or Product-Moment Correlation | AllPsych
Correlation Pearson Product Moment Using SPSS - SPSS Tests