Before you begin your research, let's talk about synonyms and quotation marks. Both of them will help you narrow down the scope of your research and bring you more relevant results.
First think about possible synonyms for your topic. If I were doing this research (and I did), I would use the following word combinations in an Advanced Search:
Gender
"gender differences"
"cognitive performance"
"cognitive abilities"
I used quotation marks around the phrases to keep them together as a search term instead of looking for individual words.
The advanced search uses Boolean Operators. There's a lot Boolean Operators can do to make your searching more precise. Check out this YouTube video.
Now you're ready to search. From the Library Database navigation on the left, choose PowerLibrary. I found the best sources in the following databases:
Academic OneFile
InfoTrac Newsstand
Make sure to check the "Full Text" box for your searches.
I also found good sources in Google Scholar.
The best part about using these sources is that they provide citations for you. Just remember to copy and paste them into your Works Cited document as soon as you decide you will use them.