Answer :
Answer:
Lists each source that looks as if it might be helpful in speech
Explanation:
The preliminary bibliography is the list of each relevant research source in relation to the theme of the speech, from single publications, newsletters, journals, magazines, books, researches, monographs, theses, etc. to oral communication: radio, tape recording magnetic or audiovisual: films and television. Its purpose is to put the researcher in direct contact with everything that was written or produced and is related to the theme of the speech.