Budiarsana, T. (2017). Stretching White Cat [Foto]. Geraadpleegd van https://www.pexels.com/photo/stretching-white-cat-979247/
Dave, A. (2018). Man Playing Guitar [Foto]. Geraadpleegd van https://www.pexels.com/photo/man-playing-guitar-977971/
Man Running on Side of Road. (2016). [Foto]. Geraadpleegd van https://www.pexels.com/photo/adventure-athlete-athletic-daylight-235922/