Larson, Gary, author
Andrews and McMeel, 1994
Buku Teks
Stocholm, 1958
Buku Teks
Europe Publications Limited, 1992
Buku Referensi
Hardy, Thomas, 1840-1928, author
Everyman's Library, 1991
Buku Referensi
Thompson, Warren S., author
The University of Chicago Press, 1959
Buku Teks