Logan, S.R.
Taylor and Francis, 1998
Buku Teks
Collis, John Stewart
Williams Sloane Assosiation, 1955
Buku Teks
Stewart, Kilton
W.W. Norton & Company, 1954
Buku Teks
Ranson, Stewart
Cassell Educational , 1994
Buku Teks
Phoenix, Rodney D., author
Quintessence, 2008
Buku Teks