Dowrick, D. J., author
John Wiley & Sons, 1977
Buku Referensi
Dowrick, David J., author
Wiley, 1987
Buku Teks
Penelis, George G.
E & FN Spon, 1997
Buku Teks
Alfred, author
2018
UI - Skripsi (Membership)
Ambrose, James E., author
John Wiley & Sons, 1980
Buku Teks