The author is the origin of the text. And when you are examining the source it is possible that you could look for the author's purpose.
Not consisting of or related to language : not linguistic
… nonlinguistic sounds such as whistles, yells, laughs, and cries … —American Speech
… produce as their immediate response a linguistic or nonlinguistic signal of understanding or continued attention. —W. Nelson Francis
The answer would be either caught or freezing ball
I would include the sentence "Much of Emily Dickinson’s poetry has the same rhythm as the song, “The Yellow Rose of Texas”" on a survey. A source card is a note card used for indexing and referencing the main page and a note card is a small note used for a speech reminder. A survey is a research of something and in this case, the survey is the research of comparison between the poem and the song.
