APA
Khan M. A., . (2009). Ankylosing spondylitis. Oxford: Oxford University Press.
Chicago
Khan Muhammad Asim, . 2009. Ankylosing spondylitis. Oxford: Oxford University Press.
Harvard
Khan M. A., . (2009). Ankylosing spondylitis. Oxford: Oxford University Press.
MLA
Khan Muhammad Asim, . Ankylosing spondylitis. Oxford: Oxford University Press. 2009.