Mason, Philip
Oxford University Press, 1970
Buku Teks
Walter, Paul A.F.
McGraw-Hill, 1952
Buku Teks
Parrillo, Vincent N.
Pearson, 2014
Buku Teks
edited by Edgar T. Thompson, Robert E. Park
Duke University Press, 1939
Buku Teks
Yarwood, A.T.
Methuen, 1982
Buku Teks