Buku Teks
Bukharin, Nikolai, author
Seagull, 2006
Buku Teks
[translated by Jim Riordan; edited by Yuri Sdobnikov]
Progress Publishers, 1971
Buku Teks
Pigou, A.C. (Arthur Cecil), author
Macmillan, 1958
Buku Teks
Carr, E.H. (Edward Hallet), author
Macmillan, 1959
Buku Teks