Howell, David C., author
Cengage Learning, 2017
Buku Teks
Quirk, Thomas, author
Springer, 2012
eBooks
Field, Andy, author
Sage Publications, 2009
Buku Teks
Wonnacott, Ronald J., author
John Wiley and Sons, 1982
Buku Teks
Field, Andy P., author
SAGE Publications, 2016
Buku Teks