Milton, Janet Susan, author
McGraw-Hill , 1992
Buku Teks
Mead, R., author
Chapman & Hall, 1993
Buku Teks
MnMillen, Wyne
University of Chicago Press , 1951
Buku Teks
Hanushek, Eric A., author
Academic Press, 1977
Buku Teks
Haldar, Achintya, author
John Wiley & Sons, 2000
Buku Teks