The preliminary bibliography
lists each source that looks as if it might be in speech
should be prepared after the speaker has finished researching the speech
identifies sources that the speaker is sure will be used in the speech
should contain a maximum of three or four sources

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.

shakespeare was famous for writing in iambic pentameter, which is a specific way of rhyming sonnet lines in ten syllables. there are also forms of unrhymed iambic pentameter, as in macbeth, with the noble characters.