Douglas, Anthony, author
Poutrege, 1998
Buku Teks
Johnson, Norman, author
Martin Robertson, 1981
Buku Teks
Johnson, H. Wayne, author
F.E. Peacoock Publishers, 1986
Buku Teks
Algie, Jimmy
kogan page, 1975
Buku Teks
Leny Sukowati, author
2015
UI - Tesis (Membership)