Ashworth, Allan
Gramedia Pustaka Utama , 1994
Buku Teks
Prins, Jan, author
Ghalia Indonesia, 1982
Buku Teks
Weston, J. Fred (John Fred), 1916-, author
ESG , 1981
Buku Teks
Gabel, Robert A., author
Erlangga, 1988
Buku Teks
Schonberger, Richard John, author
Prenhallindo , 1997
Buku Teks