Posener, Julius, author
MIT Pres, 1992
Buku Teks
edited by Svend Dahl and H.G. Topsae-Jensen; translated by W. Glyn Jones
Berlingske Bogtr, 1955
Buku Teks
Moscow Foreign Languages Publishing House 1959
Buku Teks
Makarenko, A.S., author
Foreign Languages Publishing House, 1920
Buku Teks
Ackerman, Robert
Cambridge University Press , 1990
Buku Teks