Situmorang, Sitor, 1923-2014
Kiwari, 1963
Buku Teks SO
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1991
UI - Skripsi Membership
Artikel Jurnal
Muhammad Rusdi
Universitas Indonesia, 2005
UI - Tesis Membership
[Publisher not identified], [Date of publication not identified]
Naskah