Cady, John F.
Cornell University Press, 1958
Buku Teks SO
Cady, John F.
Cornell University Press, 1958
Buku Teks SO
Roveda, Vittorio
River Books, 2005
Buku Referensi
The Core University , 1994
Buku Teks
Lall, Vikram
Malaysia JF Publishing, 2014
Buku Referensi