Ronen, Simcha
John Wiley & Sons, 1986
Buku Teks
Keegan, Warren J.
Prentice Hall of India, 1982
Buku Teks
Shapiro, Alan C.
John Wiley Sons, 1999
Buku Teks
Keegan, Warren J.
Prentice-Hall, 1980
Buku Teks
Shapiro, Alan C.
John Wiley & Sons, 2003
Buku Teks