Hamp, E. P., Gutiérrez, A. L., & Rankin, E. (1979). Composition plus level F. Harper and Row.
Lua i Stíl Chicago (17ú heag.)Hamp, Eric P., Arturo Luis Gutiérrez, agus Earl Rankin. Composition Plus Level F. Harper and Row, 1979.
Lua MLA (9ú heag.)Hamp, Eric P., et al. Composition Plus Level F. Harper and Row, 1979.
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