Silvester Goridus Sukur
Indonesia Cerdas, 2007
Buku Teks
Ward, Dederick C.
Scarecrow Press, 1981
Buku Referensi
Silvester Goridus Sukur
Indonesia Cerdas, 2007
Buku Teks
Rapoport, Alan M.
Simon & Schuster , 1991
Buku Teks
Wasserman, Max J.
D.C. Health and Company, 1966
Buku Teks