Citing manuals don't distinguish primary from secondary sources. They cite by type of material/format, e.g. a book, periodical (newspaper, magazine, or scholarly journal), correspondence, oral communication (speeches, recordings, etc.), images (photograph, painting, etc.), not whether it is a primary source or archival.
Consult the style manual you are using to determine how to cite a source.
Librarians created research guides to the major style manuals (APA, Chicago/Turabian, & MLA). Click on our citing research guide link below to access our guides to manuals that provide examples for citing sources.