Legum, Colin
Frederick A Preager, 1965
Buku Teks
Dunn, Dana S., author
Longman, 2011
Buku Teks
Barnet, Sylvan, author
Batsford Academic and Educational, 1985
Buku Teks
Barnet, Sylvan, author
Little, Brown, 1979
Buku Teks
Pechenik, Jan A., author
Pearson Longman, 2007
Buku Teks