Cita APA (7th ed.)

Elbourne, D., Altman, D., Higgins, J., Curtin, F., Worthington, H., & Vail, A. (2002). Meta-analyses involving cross-over trials: Methodological issues.

Cita Chicago (17th ed.)

Elbourne, DR, D. Altman, J. Higgins, F. Curtin, H. Worthington, i A. Vail. Meta-analyses Involving Cross-over Trials: Methodological Issues. 2002.

Cita MLA (9th ed.)

Elbourne, DR, et al. Meta-analyses Involving Cross-over Trials: Methodological Issues. 2002.