Tolong jelaskan mengenai excerpt and text search dari Ibu Negara Amerika Serikat

Curriculum unit based on primary sources.

Caroli, Betty Boyd. "The Role of First Lady" in Graff, Henry F., ed. The presidents: A Reference History (3rd ed. 2002)  online

Hummer, Jill Abraham. First Ladies and American Women: In Politics and at Home (UP of Kansas, 2017); 269 pages;

On media images of Michelle Obama.