APA
Bös K., Bös K., . (1997). Walking for fitness & health. New York: Sterling Pub. Co.
Chicago
Bös Klaus, Bös Klaus, . 1997. Walking for fitness & health. New York: Sterling Pub. Co.
Harvard
Bös K., Bös K., . (1997). Walking for fitness & health. New York: Sterling Pub. Co.
MLA
Bös Klaus, Bös Klaus, . Walking for fitness & health. New York: Sterling Pub. Co. 1997.