Phụ lục E: Tài liệu tham khảo

• Student. "The probable error of a mean." Biometrika 1908;6(1):1–25. — Bài báo gốc về t-test.
• Mann HB, Whitney DR. "On a Test of Whether one of Two Random Variables is Stochastically Larger than the Other." Ann Math Statist 1947;18(1):50–60.
• Pearson K. "On the criterion that a given system of deviations from the probable in the case of a correlated system of variables is such that it can be reasonably supposed to have arisen from random sampling." Philos Mag 1900;50:157–175.
• Altman DG. "Practical Statistics for Medical Research." Chapman & Hall, 1991.