Ronen, Simcha, author
John Wiley & Sons, 1986
Buku Teks
LaPalombara, Joseph, author
Conference Board, 1977
Buku Teks
Keegan, Warren J., author
Prentice Hall of India, 1982
Buku Teks
Shapiro, Alan C.
John Wiley Sons, 1999
Buku Teks
Keegan, Warren J., author
Prentice-Hall, 1980
Buku Teks