Robinson, James Harvey, 1863-1936, author
Harper, 1930
Buku Teks
Ratner, Carl, author
Lawrence Erlbaum Associates, 2006
Buku Teks
edited by Raymond Cochrane and Douglas Carrol
Falmer Press, 1991
Buku Teks
Green, Arnold W., author
McGraw-Hill, 1975
Buku Teks
Sampson, Edward G., author
John Wiley & Sons, 1976
Buku Teks