Larson, Laurence M., author
Holt , 1926
Buku Teks
Morton, A.L., author
Victor Gollancz, 1938
Buku Teks
Hobday, Peter, author
Priory Press, 1976
Buku Teks
edited by Richard L. Greaves
D.C. Heath, 1974
Buku Referensi
edited by Albert C. Baugh
Appleton-Century-Crofts, 1948.
Buku Teks