Yanty Saurmauli, author
Universitas Indonesia, 2005
UI - Skripsi (Membership)
Caputo-Mayr, Maria Luise
Berlin Agora 1978
Buku Teks
Stockum, Th C van
Buku Teks
Vollmer, Conrad
Prisma Verlag ,
Buku Teks
Haensch, Gunther, author
Beck, 1994
Buku Referensi