Timings, R.L. (Roger Leslie), 1927-, author
Longman, 2000
Buku Teks
Kluwer Academic Publishers, 1995,
Buku Referensi
Thibodeau, Gary A., 1938-2013, author
2007
Buku Teks
edited by Ernest Rhys
J.M Dent & Sons, 1927
Buku Teks
Miller, Henry Arthur, author
Pergamon Press, 1969
Buku Teks