Binne, Andrew
Pitman, 1951
Buku Teks
Whinttington, O. Ray, author
McGraw-Hill Irwin, 2014
Buku Teks
Stettler, Howard F., author
Prentice-Hall, 1982
Buku Teks
Binnie, Andrew
London, Sri Isaac Pitman & Sons, Ltd. 1951,
Buku Teks
De Paula, F. R. M. (Frederic Rudolf Mackley), 1882-1954, author
Pitman, 1975
Buku Teks