Hoffman, Lois Wladis, author
San Francisco, 1984
Buku Teks
Udy, Stanley H., 1928-, author
Prentice-Hall, 1970
Buku Teks
The University of Michigan Press, 1965
Buku Teks
edited by N. Brian Davis
NC Press, 1976
Buku Teks
Kessler-Harris, Alice
Oxford University Press, 1983
Buku Teks