Nichols, Jeannette P., author
D. Appleton-Century, 1943
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1961
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1966
Buku Teks
Schaller, Michael, author
Oxford University press, 1979
Buku Teks
Keylor, William R., 1944-, author
Oxford University Press, 1996
Buku Teks