1
Published 1993
2
3
Published 1984
4
Published 1993
5
by Pham, Hoang Mai.
Published 2004
6
by Kaser, Michael
Published 1997
7
Published 1994
8
by Nkrumah, Kwame, 1909-
Published 1965
9
Published 2005
10
Published 1996
11
by Luo, Yadong
Published 1998
12
13
Published 1977
14
15
Published 1997
16
Published 1971
17
by Hoang Van Huan
Published 1997
18
Published 2001
19
by Tan, Gerald
Published 1999
20
Published 2004