Fersch, Ellsworth A.
Charles C. Thomas, 1979
Buku Teks
Rubin, Sol, author
Oceana Publications, 1976
Buku Teks
Moreland, Canoll C., author
Oceana Publications, 1957
Buku Teks
Taylor, Sandie, author
Routledge, 2019
Buku Teks
Llewellyn, Karl N.
Little, Brown and Company, 1960
Buku Teks