Paat, J.
Pradnya Paramita, 1996
Buku Teks
Gildebrand, A.G.
Moskovskogo Universiteta, 1968
Buku Referensi
Dony Ariyus
Andi Yogyakarta, 2009
Buku Teks
Kim, En-hyong
Naramal, 2010
Buku Teks
edited by Peter Newman, Murray Milgate and John Eatwell
Macmillan, 1992
Buku Referensi