References

Faul, Franz, Edgar Erdfelder, Axel Buchner, and Albert-Georg Lang. 2009. “Statistical Power Analyses Using g* Power 3.1: Tests for Correlation and Regression Analyses.” Behavior Research Methods 41 (4): 1149–60.
Faul, Franz, Edgar Erdfelder, Albert-Georg Lang, and Axel Buchner. 2007. “G* Power 3: A Flexible Statistical Power Analysis Program for the Social, Behavioral, and Biomedical Sciences.” Behavior Research Methods 39 (2): 175–91.
Mayr, Susanne, Edgar Erdfelder, Axel Buchner, and Franz Faul. 2007. “A Short Tutorial of GPower.” Tutorials in Quantitative Methods for Psychology 3 (2): 51–59.