Altenbach, Alexander V., editor
[, Springer], 2012
eBooks
Cesta, Toni G., author
Mosby , 2002
Buku Teks
Cohn, Theodore
Amacom , 1974
Buku Teks
Wriggins, W. Howard
Columbia University Press, 1969
Buku Teks
Morrison, Charles E., author
Martin Press, 1978
Buku Teks