APA
(1991). British Medical Journal Vol.301, No.6749-6765, Sept-Dec 1991. London: Bristish Medical Association.
Chicago
1991. British Medical Journal Vol.301, No.6749-6765, Sept-Dec 1991. London: Bristish Medical Association.
Harvard
(1991). British Medical Journal Vol.301, No.6749-6765, Sept-Dec 1991. London: Bristish Medical Association.
MLA
British Medical Journal Vol.301, No.6749-6765, Sept-Dec 1991. London: Bristish Medical Association. 1991.
