by V. Dobrovolsky... [et.al.]
Peace Publishers, 1977
Buku Teks
Singh, Balbir
Vikas Publishing House, 1982
Buku Teks
Movnin, M.
Moscow: Mir Publishers, 1975
Buku Teks
Wilson, Charles E., author
Prentice-Hall, 1997
Buku Teks
Spotts, M.F. (Merhyle Franklin), author
Prentice-Hall, 1985
Buku Teks