Frankfurt Insel Verlag 1974
Buku Referensi
Thomas, Joseph
Philadelphia : J.B. Lippincott, 1915
Buku Referensi
Tirta, Nyak Wali Alfa
Depdikbud , 1984
Buku Teks
Boerner, Peter
Hamburg Rowohlt Taschenbuch 1964
Buku Teks
Herdi Sahrasad
Freedom Foundation, [date of publication not identified]
Buku Teks