BAKER, Richard. Measuring walking [elektronický zdroj]. London : Mac Keith Press, 2013. 3 online zdroje. Practical guide from Mac Keith Press. Dostupné na internetu: <http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&db=nlabk&AN=579716> ISBN 9781908316691.