APA
(11999). Proceedings of the National Academy Of Sciences of the United States of America. London: BMJ Publishing Group Ltd.
Chicago
11999. Proceedings of the National Academy Of Sciences of the United States of America. London: BMJ Publishing Group Ltd.
Harvard
(11999). Proceedings of the National Academy Of Sciences of the United States of America. London: BMJ Publishing Group Ltd.
MLA
Proceedings of the National Academy Of Sciences of the United States of America. London: BMJ Publishing Group Ltd. 11999.