Yeltsin, Boris Nikolayevich
Time Books , 1994
Buku Teks SO
Skrine, Francis Henry, 1847-1933
Cambridge University Press, 2013
Buku Teks SO
Vernadsky, George
At The Clarendon Press, 1959
Buku Teks SO
Halasz, Nicholas
Ronald Press, 1959
Buku Teks SO
Riasanovsky, Nicholas V.
Oxford University Press, 1963
Buku Teks SO