Serrats, Marta
Page one publishing pte ltd, 2011
Buku Referensi
Mega Parlintara Kusmirat
2018
UI - Skripsi (Membership)
Massachusetts: Rockport Publishers,, 1997
Buku Teks
Plunkett, Drew
Laurence King, 2010
Buku Teks
Indecs Publishing, 1990
Buku Referensi