Gaya APA

DEWI, R, R, S. (2007). The effectiveness of using songs to improve the listening ability of the students in vocational ... . : Sebelas Maret University.

Gaya MLA

DEWI, Renita, Ratna, Sari. "The effectiveness of using songs to improve the listening ability of the students in vocational ...". : Sebelas Maret University, 2007. Skripsi.