Amstrong, Michael, author
Crest Publishing House, 1999
Buku Referensi
Armstrong, Michael, author
Bhuana Ilmu Populer, 2003
Buku Teks
Armstrong, Michael, author
Gramedia, 2003
Buku Teks
Armstrong, Michael, author
Gramedia, 2003
Buku Teks
Cambridge University Press, 2015
eBooks