There are several sources for locating professional journal articles listed below. Before you start searching you may want to check out the “Thesaurus” or “Subject List” in each database, as well as each database’s special limiting features (usually in the “Advanced Search” section). Your goal in most research is to get a listing of articles and books which most closely match your needs. Limiting your search to articles where “attachment” (for example) is the subject of the article will return fewer results but they will be more directly relevant to your research. Check to see if there is a “Thesaurus” or “Subjects” link somewhere near the top of each database; then check to make sure the term you are thinking of is actually the one used as the subject term.
Your results will also be more useful if you can limit by gender, age, range, or other factors. Look for these options in the “Advanced Search” section (if they don’t show up automatically). PsycInfo has excellent features for these kinds of limits.