Quote From jepsonclough:
Err shouldn't you be citing the most relevant material whether that is journals or other sources (eg governement reports). Don't ignore somethign that is key just because it doesn't have a high impact factor (and impact factors vary so much by subject that a high one in one discipline would be considered very low in another)
ah yes, agree in general. But my sup does prefer me to use higher impact citations where possible. Obviously government reports etc are the exception. But she does scan my reference list and if there are too many 'journal of never heard ofs' she asks me to go and find better sources.