Google Scholar can help you find articles and books. If you're comfortable searching Google, this may be a good place to start.
You may want to read this Frequently Asked Question on how to get the most out of Google Scholar
A continuously updated online collaboration between the National Association of Social Workers (NASW Press) and Oxford University Press (OUP). Building off the classic reference work, , it includes articles on key topics ranging from international issues to ethical standards. New articles and revisions to existing articles added regularly.
Notable American Women
In addition to offering the Notable American Women books above this site includes primary source material. After searching for the person look for results under Author.
Trying using some of the following words combined with the name of your pioneer or a related subject.
*You may want to combine some of the above words using "or"