Gibbons, J. (2000). Generic downwards accumulations. Elsevier.
Lua i Stíl Chicago (17ú heag.)Gibbons, J. Generic Downwards Accumulations. Elsevier, 2000.
Lua MLA (9ú heag.)Gibbons, J. Generic Downwards Accumulations. Elsevier, 2000.
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