[publisher not identified], [date of publication not identified]
Naskah
Smith, Wilfred Cantwell, author
Bhratara, 1964
Buku Klasik
[publisher not identified], [date of publication not identified]
Naskah
Daulay, Saleh Partaonan, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2002
UI - Tesis Membership
H. Abudardiri, author
Persatuan Mukhamadiyah, 1926
Buku Klasik