Ravnholt, Henning
Det Danske Selskab, 1950
Buku Teks
Digby, Margaret, author
Hutchinson University Library , 1960
Buku Teks
Mohammad Hatta, 1902-1980, author
Cornell University Press, 1957
Buku Teks
Barou, N.
P.S. King & Son, 1932
Buku Teks
Odhe, Thersten
Cooperative Lague of the USA, 1960
Buku Teks