Rasch, Dieter, author
John Wiley & Sons, 2011
Buku Teks
Green, Samuel B., author
Prentice-Hall, 2000
Buku Teks
Wagner, William E., author
Pine Forge Press, 2007
Buku Teks
Williams, Helen M., author
SAGE, 2020
Buku Teks
Wonnacott, Ronald J., author
John Wiley & Sons, 1982
Buku Teks