Dini Elphitanya
Fakultas Teknik Universitas Indonesia, 2005
UI - Skripsi Membership
Davis, Kenneth P.
McGraw-Hill, 1976
Buku Teks
Mather, A.S.
Wiley , 1986.
Buku Teks
Ely, Richard T.
University of Wisconsin Press, 1964
Buku Teks
World Bank, 1974
Buku Teks