edited by Helmut Arntz
Press and Information Office of the Federal Government, 1961
Buku Teks
Chudal, Alaka Atreya
Oxford University Press, 2016
eBooks
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1977
UI - Tesis Membership
edited by Helmut Buchholt and Ulrich Mai
Institute of Southeast Asian Studies, 1994
Buku Teks
Rangkuti-Hasibuan, Sofia
Dian Rakyat, 1992
Buku Teks