Westwood, J. C. N. (1963). Smallpox in England and Wales 1962.
Chicago Style CitationWestwood, J C N. Smallpox in England and Wales 1962. 1963.
Cita MLAWestwood, J C N. Smallpox in England and Wales 1962. 1963.
Atenció: Aquestes cites poden no estar 100% correctes.