Gourville, H. d. (1959). The Modern Handbook of English (13th.ed.). Crespillo.
Lua i Stíl Chicago (17ú heag.)Gourville, H.D. de. The Modern Handbook of English. 13th.ed. Buenos Aires: Crespillo, 1959.
Lua MLA (9ú heag.)Gourville, H.D. de. The Modern Handbook of English. 13th.ed. Crespillo, 1959.
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