Dallin, Leon
WM. C. Brown Co. Pub., 1965
Buku Teks SO
Drotning, Phillip T.
Doubleday, 1968
Buku Teks SO
Clark, William S.
Houghton-Miffiln, 1987
Buku Teks SO
Borror, Donald J.
Houghton Mifflin, 1976
Buku Referensi
Chielens, Edward E.
Gale Research, 1975
Buku Teks SO