Phụ lục D: Tài liệu tham khảo

• Doll R, Hill AB. "Smoking and carcinoma of the lung." BMJ 1950;2:739–748.
• Doll R, Hill AB. "The mortality of doctors in relation to their smoking habits." BMJ 1954;1:1451–1455.
• Altman DG. "Practical Statistics for Medical Research." Chapman & Hall, 1991 — Ch. 7: Relative risk and odds ratio.
• Kirkwood BR, Sterne JAC. "Essential Medical Statistics." 2nd ed., Blackwell, 2003 — Ch. 16: Measures of association.
• Higgins JPT, Thompson SG, Deeks JJ, Altman DG. "Measuring inconsistency in meta-analyses." BMJ 2003;327:557–560.