Ennis, Robert H.
Prentice-Hall, 1996
Buku Teks
Ennis, Robert Hugh
Prentice-Hall, 1996
Buku Teks
Salmon, Merrilee H., author
Wadsworth, 2013
Buku Teks
Walton, Douglas, author
Cambridge University Press, 2006
Buku Teks
McKim, Robert H.
Brooks/Cole, 1972
Buku Teks