Vivian, John
Pearson, 2011
Buku Teks
Wright, Charles Robert
Random House, 1975
Buku Teks
Hovland, Carl I.
Princeton University Press, 1949
Buku Teks
O`hara, Robert C.
Random House , 1961
Buku Teks
Schramm, Wilbur
American Hospital Association, 1974
Buku Teks