Wills, G. (1994). Certain trumpets: The call of leaders. Simon & Schuster.
Lua i Stíl Chicago (17ú heag.)Wills, Garry. Certain Trumpets: The Call of Leaders. New York: Simon & Schuster, 1994.
Lua MLA (9ú heag.)Wills, Garry. Certain Trumpets: The Call of Leaders. Simon & Schuster, 1994.
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