Bolander, Donald O., author
Career Publishing, 1992
Buku Referensi
Universitas Indonesia, 1998
UI - Skripsi (Membership)
Davis, Jerry C., author
McGraw-Hill, 1981
Buku Teks
Birch, Paul, author
Erlangga, 2001
Buku Teks
Lambrou, Peter, author
Rider, 2000
Buku Teks