Covert observation in practice : lessons from the evaluation of the prohibition of smoking in public places in Scotland
Citation
Petticrew , M , Semple , S , Hilton , S , Creely , K S , Eadie , D , Ritchie , D , Ferrell , C , Christopher , Y & Hurley , F 2007 , ' Covert observation in practice : lessons from the evaluation of the prohibition of smoking in public places in Scotland ' , BMC Public Health , vol. 7 , 204 . https://doi.org/10.1186/1471-2458-7-204