Wolf, Eric R.
Prentice-Hall, 1966
Buku Teks
Gordon, Robert Aaron
Berkeley, Cal, University of California Press
Buku Teks
Cremer, Jan
De Bezige Bij, 1993
Buku Teks
Heinz GaÌ?rtner, Adrian Hyde-Price, Erich Reite, editor
Lynne Rienner Publishers, 2000
Buku Teks
Brown, J. F.
Frederick A. Preager, 1966
Buku Teks