Aspinwall-Roberts, Elaine, author
McGraw-Hill, 2012
Buku Teks
Andy Mantell, Terry Scragg, editor
Learning matters Ltd., 2008
Buku Teks
McInnis-Dittrich, Kathleen, author
Pearson Prentice Hall, 2013
Buku Teks
Dubois, Brenda, 1949-, author
Allyn and Boston, 1992
Buku Teks
Gore, M.S., author
Asia Publishing House, 1965
Buku Teks