Pikoulakis, Emmanuel, author
Macmillan, 1995
Buku Teks
Sanderson, Allen R., author
McGraw-Hill, 1981
Buku Teks
Meyers, Albert, author
Englewood Cliffs, 1956
Buku Klasik
Baily, Martin Neil, author
Richard D. Irwin, 1995
Buku Teks
Blanchard, Olivier, author
Pearson, 2009
Buku Teks