Trockij, Lev D.
Fischer, 1931
Buku Klasik
Foreign Languages Publishing House, 1960
Buku Teks
Batalden, Stephen K., author
Cambridge University Press, 2015
Buku Teks
Kollmann, Nancy Shields, author
Oxford University Press, 2017
eBooks
Sternberg, Fritz, author
The John Day, 1953
Buku Teks