Timms, Noel
Routledge & Kegan Paul, 1973
Buku Teks
Ferguson, Elizabeth A., author
J.B. Lippincott, 1975
Buku Teks
Geeorge Allen , 1971
Buku Teks
Johnson, Louise C., 1923-, author
Allyn and Bacon, 1986
Buku Teks
edited by Frederic G. Reamer
Columbia University Press, 1994
Buku Teks