Delorit, Richard J., author
Prentice-Hall, 1967
Buku Teks
Muhammad Ashraf, editor
[, Springer], 2012
eBooks
Poate, C.D.
The World Bank , 1985
Buku Teks
Smith, Harris P. (Harris Pearson), author
Gadjah Mada University Press, 1990
Buku Teks
by Douglas D. Bishop ... [et al.]
McGraw-Hill, 1983
Buku Teks