Cooley, William W., author
Robert E. Krieger, 1986
Buku Teks
Johnson, Richard A., author
Pearson Education International, 2007
Buku Teks
Hardle, Wolfgang Karl, author
Springer , 2012
eBooks
Joseph F. Hair Jr., author; William C. Black, author; Barry J. Babin, author; Rolph E. Anderson, author
Pearson, 2014
Buku Teks
Schafer, J.L., author
Chapman & Hall, 1997
Buku Teks