McCarthy, Michael, author
Erlangga, 2002
Buku Teks
DeTienne, Kristen Bell, author
Prentice-Hall, 2002
Buku Teks
Azar, Betty Schrampfer, 1941-, author
Prentice Hall Regents, 1989
Buku Referensi
Azar, Betty Schrampfer, 1941-, author
Longman, 2002
Buku Teks
Azar, Betty Schrampfer, 1941-, author
Pearson Education, 2009
Buku Teks