Hudson, William Henry
George G. Harrap, 1913
Buku Klasik
Richard, Paul
Omiwa Jinsha Press, 1976
Koleksi Publik
Samway, Katharine Davies
Maine : Stenhouse, 1996.,
Buku Teks
Carter, Ronald
Longman, 1991
Buku Teks SO
Rosenblatt, Louise M.
Appleton-Century-Crofts, 1938
Buku Teks SO