Ehrenberg, A.S.C., author
John Wiley & Sons, 1975
Buku Teks
Ott, Lyman, author
Duxbury Press, 1993
Buku Teks
Anderson, Alan J.B.
Chapman and Hall , 1989
Buku Teks
Taylor, John Keenan
Lewis Publishers, 1990
Buku Teks
Kohler, Ulrich, author
Stata Press, 2009
Buku Teks