Eiteman, David K., author
Pearson, 2010
Buku Teks
Dymsza, William A., author
McGraw-Hill, 1972
Buku Teks
Ronen, Simcha, author
John Wiley & Sons, 1986
Buku Teks
Keegan, Warren J., author
Prentice Hall of India, 1982
Buku Teks
LaPalombara, Joseph, author
Conference Board, 1977
Buku Teks