Hornblower, Simon
Routledge, Taylor & Francis Group, 2002
Buku Teks
Hazel, John
Routledge, 2000
Buku Teks
Hazel, John
Routledge, 2000
Buku Referensi
Hardy, W.G.
Schenkman Publishing Company Inc., 1962.
Buku Teks
Mellersh, H.E.L.
Simon & Schuster, 1994
Buku Referensi