Rene Suhardono, author
Kompas, 2013
Buku Teks
Rene Suhardono, author
kompas media nusantara , 2019
Buku Teks
Maxwell, John C., author
Thomas Nelson, 1991
Buku Teks
Rich, Phil, author
John Wiley & Sons, 2000
Buku Teks
Brunei Press Sdn Bhd, 1999
Buku Referensi