Often times it is important to hear from the practitioners themselves to understand beliefs and practices. The Society of Friends keeps an extensive website updated.
Thomas Rowlandson, European; British, 1756 - 1827. Quakers' Meeting. 1808. Artstor, library.artstor.org/asset/AMICO_SAN_FRANCISCO_103855427
Middle School In Context has many different resources for you. This link will take you to reference articles about the religion you are researching. Remember that you can use the "cite" button to have your citation made for you or exported directly into NoodleTools.
Britannica is a fantastic resource. This link has the most detail. You can also check level 2 or 1 for a quicker, but less thorough, read. Remember that Britannica will make a citation for you. Just click the checkbox at the top right of the page.
For even more detail, read the High School level article.