Artikel Jurnal
Harbelubun, J.F.X., author
Universitas Indonesia, 1998
UI - Tesis (Membership)
Adler, Mortimer Jerome, 1902-2001, author
Holt, Rinehart and Winston, 1967
Buku Teks
Bruning, Walther
Ernst Klett Verlag, 1960
Buku Teks
Weij, P.A. van der, author
Kanisius, 2000
Buku Teks