Sparke, P. (2020). Concert Prelude: Grade 4, medium / Philip Sparke. G & M Brand Publ..
Lua i Stíl Chicago (17ú heag.)Sparke, Philip. Concert Prelude: Grade 4, Medium / Philip Sparke. Wingrave, Aylesbury, Bucks, England: G & M Brand Publ., 2020.
Lua MLA (8ú heag.)Sparke, Philip. Concert Prelude: Grade 4, Medium / Philip Sparke. G & M Brand Publ., 2020.
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