Gaya APA

Sitorus, U, A, R. (2010). The important role of marketing communication in the operational system at PT.Indosat Tbk. Branch of Malang (CD) . Malang, Jatim: UNMER.

Gaya MLA

Sitorus, Ulie, Artha, Ria. "The important role of marketing communication in the operational system at PT.Indosat Tbk. Branch of Malang (CD)". Malang, Jatim: UNMER, 2010. CD-ROM.