APA-viite (7. p.)

Kälkäinen, S. (2011). The association between perceived environmental barriers and walking activity among older adults.

Chicago-viite (17. p.)

Kälkäinen, Salla. The Association Between Perceived Environmental Barriers and Walking Activity Among Older Adults. Jyväskylä, 2011.

MLA-viite (9. p.)

Kälkäinen, Salla. The Association Between Perceived Environmental Barriers and Walking Activity Among Older Adults. 2011.