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
Kraus, Michael
University of Oklahoma Press, 1953
Buku Teks
Thompson, James Westfall
Macmillan, 1958
Buku Teks