Blum, Milton L., author
Harper & Brothers , 1956
Buku Teks
Blum, Milton L., author
Harper & Row, 1968
Buku Teks
Tiffin, Joseph, author
Prentice-Hall, 1958
Buku Teks
Siegel, Laurence, author
Richard D. Irwin, 1968
Buku Teks
Ghiselli, Edwin E., author
McGraw-Hill, 1955
Buku Teks