Welch, Gita Honwana
Yetd Books, 1990
Buku Teks
Sachs, Albie
Zed Books, 1990
Buku Teks
Ross, Alf, author
Stevens & Sons Limited, 1958
Buku Teks
Freund, Paul A., author
Harvard University Press, 1974
Buku Teks
Ross, Alf, author
University of California Press, 1959
Buku Teks