Carlson, Reinhold A., author
R.S. Means, 1991
Buku Teks
Macedo, Manuel C., author
John Wiley & Sons, 1983
Buku Teks
Cooke, Robert, author
Wiley-blackwell, 2009
Buku Teks
Bradshaw, Vaughn, author
John Wiley & Sons, 1993
Buku Teks
Sitanggang, Pieter Andreas Wesly
2014
UI - Skripsi (Membership)