Corrigan, Timothy
Scott, Foresman and Company, 1989
Buku Teks
Dunn, Dana S.
Longman, 2011
Buku Teks
Barnet, Sylvan
Batsford Academic and Educational, 1985
Buku Teks
Barnet, Sylvan
Little, Brown, 1979
Buku Teks
Pechenik, Jan A.
Pearson Longman, 2007
Buku Teks