1
Sih, Paul K. T.
St. John's University Press,
1972,
2
Smith, Michael P.
Cornell University Press,
2008,
3
Liang, Ching
St. John's University Press,
1972,
5
Hammock, Allan S.,
McGraw-Hill,,
1995,
7
Aguirre, Adalberto.
Dushkin Pub. Group,
1995,
8
D'Souza, Dinesh
Free Press,
1995,
9
Canon, David T.
W.W. Norton,
1997,