Campbell-Johnson, Alan, author
Ives Washburn, 1955
Buku Teks
McIlwain, Charles Howard, author
Russell and Russell, 1965
Buku Teks
Hill, Michael
SAGE, 2014
Buku Teks
Derbyshire, J. Denis, author
McGraw-Hill , 1979
Buku Teks
Sage Publications , 1992
Buku Teks