edited by Otto Kinne
John Wiley & Sons, 1980
Buku Teks
Spotte, Stephen, author
John Wiley & Sons, 1973
Buku Teks
Moller, H.
Verlag Moller-Kiel, 1983
Buku Teks
edited by A. Houghton Brodrick
Frederick A. Praeger, 1972
Buku Teks
Campbell, John R., author
McGraw-Hill , 1969
Buku Teks