I have a transcript of an audio recording of an interview with W. E. B. Dubois. What would be the appropriate footnote citation format in the...

The latest edition of Harbrace
Essentials, by Cheryl Glenn and Loretta Gray, provides guidelines for four
different methods of citing sources; Modern Language Association style; Chicago Manual
of Style; American Psychological Association style; and Council of Science Editors
style.

Most teachers would agree with the following
statement:

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There is no single, "right" way to cite a source;
there are various ways required in different circumstances and by different teachers,
and it is important to follow your teacher's precise directions.  -- Robert C. Evans  
:-)

If you are writing your
paper for an English class, the preferred choice is probably the Modern Language
Association style.  If you are writing your paper for a history class, the preferred
choice is probably the Chicago Manual of Style.  You may want to ask your teacher which
of these two styles of documentation s/he prefers.

For
examples of how to cite interviews using the MLA and CMS methods, see the links
below.