CLARKE, L. (1994). The Essence Of Change / Liz Clarke. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)CLARKE, Liz. The Essence Of Change / Liz Clarke. Prentice-Hall, 1994.
Lua MLA (8ú heag.)CLARKE, Liz. The Essence Of Change / Liz Clarke. Prentice-Hall, 1994.
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