1. The Probable Error of the Mean;Student;Biometrika,1908
2. 1500 Scientists lift the lid on reproducibility;Baker;Nature,2016
3. Smith N. Why 'Statistical Significance' is often Insignificant. Economics. Bloomberg Opinion. 2017.
4. Kohls Moritz. Zweistichproben-t-Test (2016). 2018.
5. Bartsch Hans Jochen. Paperback Mathematical Formulas. 18th edn. Germany: Fachbuchverlag Leipzig Carl Hanser Verlag; 1999.