Meek, John L., author
McGraw-Hill , 1971
Buku Teks
Felton, Lewis P., author
John Wiley & Sons, 1997
Buku Teks
Ghali, A., author
Chapman and Hall , 1978
Buku Teks
Ghali, A., author
Intext Educational Publishers , 1972
Buku Teks
Jenkins, W.M., author
McGraw-Hill, 1969
Buku Teks