F.E. Peacock Publishing, Inc., 1977
Buku Teks
F.E. Peacock Publishers, Ind., 1972
Buku Teks
Coulshed, Veronica, author
Macmillan, 1988
Buku Teks
Parris, Melanie, author
McGraw-Hill, 2012
Buku Teks
Epstein, Irwin, author
F.E.Peacock Publishers, Inc., 1977
Buku Teks