Ambrose, James E., author
John Wiley and Sons, 1995
Buku Teks
Simiu, Emil
John Wiley and Sons, 1978
Buku Teks
Penelis, George G.
E & FN Spon, 1997
Buku Teks
Alfred, author
2018
UI - Skripsi (Membership)
Mardzhanishvili, M. A.
Oxonian Press, 1984
Buku Teks
Dowrick, D. J., author
John Wiley and Sons, 1977
Buku Referensi