Richardson, Samuel
Dent, 1932
Buku Teks
Jakarta : Cipta Adi Pustaka, 1991,
Buku Referensi
Burton R. Clark, Guy R. Neave, editors-in-chief
Pergamon Press, 1992
Buku Referensi
Samuel Kotz, Norman L. Johnson, editors-in-chief
John Wiley & Sons, Inc., 1982
Buku Referensi
edited by Paul J. Scheuer
Springer-Verlag, 1988
Buku Teks