APA-viite (7. p.)

Keskinen, K. E. (2021). Features of the physical environment, walking difficulty, and physical activity in old age.

Chicago-viite (17. p.)

Keskinen, Kirsi E. Features of the Physical Environment, Walking Difficulty, and Physical Activity in Old Age. Jyväskylä, 2021.

MLA-viite (9. p.)

Keskinen, Kirsi E. Features of the Physical Environment, Walking Difficulty, and Physical Activity in Old Age. 2021.