Yuliana, author
Grasindo, 2002
Buku Teks
Gamble, Teri Kwal, author
McGraw-Hill, 2013
Buku Teks
Turner, Lynn H., author
Cambridge University Press, 2019
Buku Teks
Oxford Unity Press,
Majalah, Jurnal, Buletin
Gamble, Teri Kwal, author
McGraw-Hill, 2005
Buku Teks