Meyers, Alan, 1945-, author
Pearson Education, 2014
Buku Teks
Beach, David P., author
Prentice-Hall, 1992
Buku Referensi
Gatrell, Jay D., author
Springer, 2012
eBooks
Denscombe, Martyn, author
Open University Press, 2012
Buku Teks
Woods, Geraldine, author
Hungry Minds, 2002
Buku Teks