Poulsen, Lauge N. Skovgaard, author
Cambridge University Press, 2015
Buku Teks
Fox, Frank W., author
Kendall/Hunt , 1990
Buku Teks
Walsh, Anthony, 1941-, author
Sage Publications, , 2007
Buku Teks
Sedgewick, Robert, 1946-, author
R.R. Donnelly, 2017
Buku Teks
Englebardt, Sheila P., author
Mosby , 2002
Buku Teks