Lloyd, S. (1992). Developing pasitive assertiveness. Galgotia.
Lua i Stíl Chicago (17ú heag.)Lloyd, Sam. Developing Pasitive Assertiveness. NewDelhi: Galgotia, 1992.
Lua MLA (9ú heag.)Lloyd, Sam. Developing Pasitive Assertiveness. Galgotia, 1992.
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