Seeley, Christopher
University of Hawaii Press, 2000
Buku Teks
Kent, Sherman
Appleton Century Croffs, 1967
Buku Teks
Kent, Sherman
Appleton Century Croffs, 1941
Buku Teks
Larson, Laurence M.
Holt , 1926
Buku Teks
Hall, Walter Phelps
Ginn and Company, 1953
Buku Teks