APA
Pringle M. L. K., Pringle M. L. K., . (1970). Challenge of thalidomide. London: Longman Group Limited.
Chicago
Pringle M L Kellmer, Pringle M L Kellmer, . 1970. Challenge of thalidomide. London: Longman Group Limited.
Harvard
Pringle M. L. K., Pringle M. L. K., . (1970). Challenge of thalidomide. London: Longman Group Limited.
MLA
Pringle M L Kellmer, Pringle M L Kellmer, . Challenge of thalidomide. London: Longman Group Limited. 1970.