Roysl Ministry Affairs, 1959
Buku Teks
Copenhagen : C.W.K. Gleeup Lund
Majalah, Jurnal, Buletin
Resume, Service
ARCO Publishing Company, Inc., 1967
Buku Teks
P.A Norstedt & Soner Forlag, 1981
Buku Teks
[publisher not identified], [date of publication not identified]
Naskah