Barbour, Ian G., author
Mizan , 2005
Buku Teks
Tillery, Bill W., author
McGraw-Hill, 2013
Buku Teks
Geoff Green, Ken Petford, Alan Short, David Walker
John Muray, 1975
Buku Referensi
Cunningham, William P., author
McGraw-Hill, 2005
Buku Teks
Pomeroy, John H.
Holt, Rinehart and Winston, 1964
Buku Teks