Tillery, Bill W., author
McGraw-Hill, 2013
Buku Teks
Geoff Green, Ken Petford, Alan Short, David Walker
John Muray, 1975
Buku Referensi
Pomeroy, John H.
Holt, Rinehart and Winston, 1964
Buku Teks
Derry, Gregory N., author
Princeton University Press , 1999
Buku Teks
Grayson-Smith, Hugh, author
Prentice-Hall, 1967
Buku Teks