Bizup, J. (2008). BEAM: A rhetorical vocabulary for teaching research-based writing. Rhetoric Review, 27(1), 72–86. https://doi.org/10.1080/07350190701738858
for materials a writer relies on for general information or for factual evidence.
Tertiary sources like encyclopedias, almanacs, dictionaries, directories, guidebooks, textbooks, or even Wikipedia are usually used for background.
for materials whose claims a writer engages.
Secondary sources like textbooks, edited works, books and articles that interpret or review research, histories, biographies, literary criticism and interpretation, usually serve as arguments.
for materials a writer analyzes or interprets.
Primary sources like maps, photographs, newspapers, diaries, interviews, artistic works, speeches, letters, memos, autobiographies, and correspondence are usually used as exhibits.
for materials from which a writer takes a governing concept or derives a manner of working.
This will help you begin to organize your paper by ideas, while adding your own analysis alongside your sources. The matrix shows natural connections between source and allows you to visualize the conversation surrounding your topic.