Baker, Kenneth R
John Wiley & Sons, 1985
Buku Teks
Slack, Nigel, author
Pearson, 2013
Buku Teks
Eppen, Gary D., author
Prentice Hall International, 1988
Buku Teks
Eppen, Gary D., author
Prentice-Hall, 1984
Buku Teks
Loomba, N. Paul
Macmillan, 1978
Buku Teks