Artikel Jurnal
Pereira, Maxwell
Vitasta Pub., 2008
Buku Teks
Firth, C. Barry, author
McGraw-Hill, 1979
Buku Teks
Kostenko, M. P. (Mikhail Polievktovich), 1889-1976, author
Peace Publishers,
Buku Teks
Popov, Vladimir V., author
Mir Publishers, 1970
Buku Teks