Roberts, Edward B.
Harper & Row, Pub., 1964
Buku Teks
McLeod, T. S.
Gower Press, 1971
Buku Teks
Cooper, Donald R., author
McGraw-Hill, 2001
Buku Teks
Cooper, Donald R., author
McGraw-Hill, 2008
Buku Teks
Cooper, Donald R., author
McGraw-Hill, 2008
Buku Teks