Fernando, H.J.S., editor
Springer, 2012
eBooks
New York : Pergamon , 1976
Buku Teks
DeCoursey, Rusell Myles, author
McGraw-Hill, 1980
Buku Teks
DeCoursey, Rusell Myles, author
McGraw-Hill , 1968
Buku Teks
O`hear, Anthony, author
Clarendon Press, 1997
Buku Teks