APA-viite (7. p.)
Peralta, M., & et al. Socio-demographic correlates of physical activity among European older people.
Chicago-viite (17. p.)
Peralta, M., ja et al. Socio-demographic Correlates of Physical Activity Among European Older People.
MLA-viite (9. p.)
Peralta, M., ja et al. Socio-demographic Correlates of Physical Activity Among European Older People.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.