Acheson, Patricia C.
Dood, Mead & Company, 1962
Buku Teks
Lamparello, Adam, author
NY Routledge, 2017
Buku Teks
Walker, Mary M.
General Learning Press, 1974
Buku Teks
Rosinger, Lawrence K., author
Macmillan, 1950
Buku Teks
University of Chicago Press, 1975
Buku Teks