Parish, William L
University of Chicago Press, 1978
Buku Teks
Martin, Lawrence L.
Sage Publications,Inc., 1993
Buku Teks
Cambridge University Press , 1996
Buku Teks
Green, Joan L.
Springer Publishing, 1977
Buku Teks
Trump, Ross M.
Houghton Mifflin , 1966
Buku Teks