Philosophical Library, 1944
Buku Teks
edited by Dagobert D. Runes and Harry G. Schrickel
Philosophical Library, 1946
Buku Referensi
Sin, Yong-hun, author
Hanokmunhwa, 2006
Buku Teks
Jabbar, Muhammad Abdul
University of Malaya Press, 1981
Buku Teks
German Studies,
Majalah, Jurnal, Buletin