When possible use the Advance Search feature to limit by date of publication, type of publication or specific keywords or concepts
use " " to group concepts "marketing stimuli" and spending
use truncation symbol *
Truncate a root word such as plan to get all forms of the word, i.e. market* will retrieve market, markets, marketing and marketed
If you need additional resources checkout the Research Guide for other subjects.
Otherwise, click the Browse by Subject if you need additional subject specific resources
Here are a few databases to begin your research: