by Elena Verdia...[et.al]
enClave-Ele, 2007
Buku Teks
The Linguaphone Institute, 1998
Buku Teks
Josefa García Naranjo
Graduate School of Language and Culture, Osaka University, 2019
Artikel Jurnal
Walls, Alfonso Vasseur
Mexico Diana S.A. 1963
Buku Referensi
Supit, Jenny F.D.
Kesaint Blanc, 2012
Multimedia