Tarasoff, Koozma J.
Prairie Book Dept., Western Producer, 1969
Buku Teks
Wade-Matthews, Max, author
Southwater, 2013
Buku Teks
Oxford University Press , 1996
Buku Teks
Ward, A.C., author
Longman, 1955
Buku Teks
Feng, Shuangbai, author
Zhejiang Jiaoyu Chubanshe, 2001
Buku Teks