Cita APA (7th ed.)

Armstrong, M., Cairns, B., Green, J., Reeves, G., Beral, V., & Collaborators, T. M. W. S. (2011). Reported frequency of physical activity in a large epidemiological study: Relationship to specific activities and repeatability over time. BioMed Central.

Cita Chicago (17th ed.)

Armstrong, M., B. Cairns, J. Green, G. Reeves, V. Beral, i The Million Women Study Collaborators. Reported Frequency of Physical Activity in a Large Epidemiological Study: Relationship to Specific Activities and Repeatability over Time. BioMed Central, 2011.

Cita MLA (9th ed.)

Armstrong, M., et al. Reported Frequency of Physical Activity in a Large Epidemiological Study: Relationship to Specific Activities and Repeatability over Time. BioMed Central, 2011.