Broten, Dorothy A., author
Lippincott, 1988
Buku Teks
Davidson, Jeff, author
Prenada, 2010
Buku Teks
Stoppard, Miriam
Darling Kindesley , 1991
Buku Teks
Arterburn, Stephen, author
Colorado, 2001
Buku Teks
Vicki Smith, Patrizia Collard, Paula Nicolson, Rowan Bayne
Mc Graw-Hill, 2012
Buku Teks