APA
(1991). British Medical Journal Vol.303, No.6810-6816, Nov-Dec 1991. London: Bristish Medical Association.
Chicago
1991. British Medical Journal Vol.303, No.6810-6816, Nov-Dec 1991. London: Bristish Medical Association.
Harvard
(1991). British Medical Journal Vol.303, No.6810-6816, Nov-Dec 1991. London: Bristish Medical Association.
MLA
British Medical Journal Vol.303, No.6810-6816, Nov-Dec 1991. London: Bristish Medical Association. 1991.
