Altman, D., & Bland, J. (2011). Statistics notes: Brackets (parentheses) in formulas.
Cita Chicago (17th ed.)Altman, D., i J. Bland. Statistics Notes: Brackets (parentheses) in Formulas. 2011.
Cita MLA (9th ed.)Altman, D., i J. Bland. Statistics Notes: Brackets (parentheses) in Formulas. 2011.
Atenció: Aquestes cites poden no estar 100% correctes.