https://kristankirjat.blogspot.com/2017/01/beth-lewis-suden-tie.html
Lukutoukan kulttuuriblogi: Beth Lewis: Suden tie
Kirjablogi rakkaudesta kirjallisuuteen.
beth lewissudentie
https://scholarcommons.sc.edu/sph_physical_activity_public_health_facpub/148/
"Psychosocial Mediators of Physical Activity Behavior Among Adults and " by Beth A. Lewis, Bess H....
By Beth A. Lewis, Bess H. Marcus, Russell R. Pate, et al., Published on 08/01/02