Zulaika , C. (2001). Humor Smart Message Service/ City Zulaika. Jakarta : Niaga Swadaya.
Lua i Stíl Chicago (17ú heag.)Zulaika , City. Humor Smart Message Service/ City Zulaika. Jakarta : Niaga Swadaya, 2001.
Lua MLA (8ú heag.)Zulaika , City. Humor Smart Message Service/ City Zulaika. Jakarta : Niaga Swadaya, 2001.
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