Anderson, William R.
The World Publishing, 1959
Buku Teks
edited by Peter Lemke and Hans-Werner Jacobi
Springer, 2012
eBooks
Ilham Putra, author
2018
UI - Skripsi (Membership)
Byers, Michael, author
Cambridge University Press, 2013
Buku Teks
Butler, William E., author
Sijthoff and Noordhoff, 1978
Buku Teks