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ANDI FRASTIYA (2009) Interference of Javanese Language Towards the Perceived Use of English Directive Speech Act. Skripsi thesis, UNIVERSITAS AIRLANGGA.

EDDY R. CAESARINO (2008) Investigation of Conversational Strategies Used by Female and Male Lecturers in English Department of Airlangga University (A Study of Conversation Analysis). Skripsi thesis, UNIVERSITAS AIRLANGGA.