edited by Paul A. Samuelson
McGraw-Hill, 1970
Buku Teks
Enke, Stephen, author
Prentice-Hall, 1973
Buku Teks
Slavin, Stephen, author
Richard D. Irwin, 1991
Buku Teks
Ison, Stephen, author
Prentice-Hall, 2000
Buku Teks
Blodgett, Ralp H., author
Rinehart & Company, 1951
Buku Teks