Jensen, Cecil
McGraw-Hill, 1990
Buku Teks
Cooper, Douglas
John & Sons, 2007
Buku Teks
Jensen, Cecil
McGraw-Hill Ryerson Limited, 1982
Buku Teks
Hawley, Christine
Ashgate, 2013
Buku Teks
Baskinger, Mark
Watson-Guptill Publications, 2013
Buku Referensi