APA
Keystone J., Kozarsky P. A. & Freedman D. O. (2008). Travel medicine. New york: Mosby.
Chicago
Keystone Jays, Kozarsky Phillis A and Freedman David O. 2008. Travel medicine. New york: Mosby.
Harvard
Keystone J., Kozarsky P. A. and Freedman D. O. (2008). Travel medicine. New york: Mosby.
MLA
Keystone Jays, Kozarsky Phillis A and Freedman David O. Travel medicine. New york: Mosby. 2008.
