Flynn, Norman
Harvester, 1990
Buku Teks
Van Wart, Montgomery
Garland, 1998
Buku Teks
Jones, Rowan
Financial Times Prentice Hall, 2010
Buku Teks
Starling, Grower
Wadsworth and Cengage Learning, 2011
Buku Teks
Dooren, Wouter van
Routledge, 2015
Buku Teks