Citazione APA

Williams, K., Frei, A., Vetsch, A., Dobbels, F., Puhan, M. A., & Rüdell, K. (2012). Patient-reported physical activity questionnaires: A systematic review of content and format. BioMed Central.

Stile di citazione Chicago

Williams, Kate, Anja Frei, Anders Vetsch, Fabienne Dobbels, Milo A. Puhan, e Katja Rüdell. Patient-reported Physical Activity Questionnaires: A Systematic Review of Content and Format. BioMed Central, 2012.

Citazione MLA

Williams, Kate, et al. Patient-reported Physical Activity Questionnaires: A Systematic Review of Content and Format. BioMed Central, 2012.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.