Estu Sri Luhur
Faculty of Economic and Business UIN Syarif Hidayatullah, 2019
Artikel Jurnal
BAKOSURTANAL, 2008
Buku Teks
Sobczyk, Eugeniusz J.
Taylor and Francis, 2008
Buku Teks
Fleuren-van Hal, Dorine
Martinus Nijhoff, 1986
Buku Teks
Jakarta : PT. Forum Adil Mandiri, 2006,
Majalah, Jurnal, Buletin