A block quotation is is set off from the main text as a paragraph, or block of text.
It may or may not include a citation, usually placed at the bottom.
Said no one, ever.
A paragraph (from the Greek paragraphos, “to write beside” or “written beside”) is a self-contained unit of a discourse in writing dealing with a particular point or idea. A paragraph consists of one or more sentences. Though not required by the syntax of any language, paragraphs are usually an expected part of formal writing, used to organize longer prose.