Katzner, Kenneth
John Wiley & Sons, 1994
Buku Referensi
Segal, Louis
Frederick A. Praeger, 1959
Buku Referensi
Golovinsky, M.
David Mckay, [date of publication not identified]
Buku Referensi
Texnika, 1993
Buku Referensi
Folomkina, S.
Moscow State Publishing House
Buku Referensi