La Tofi, author
La Tofi Enterprise,
Majalah, Jurnal, Buletin
Prentice-Hall, 1973
Buku Teks
Kunkel, John H.
Oxford University Press, 1970
Buku Teks
Finkle, Jason L., author
John Wiley & Sons, 1968
Buku Teks
Finkle, Jason L., author
John Wiley & Sons, 1966
Buku Teks