Petersen, Christian
Gower, 1994
Buku Teks
McDaniel, Carl
South Western Cengage Learning, 2013
Buku Teks
Armstrong, Gary (Gary M.)
Prentice-Hall, 2005
Buku Teks
McDaniel, Carl
Salemba Empat , 2001
Buku Teks
Staud, Thomas A
Prentice-Hall, 1970
Buku Teks