Dallin, David J.
The New Soviet Empire
Hollis & Carter, 1951
 Buku Teks SO
The Soviet empire: expansion & datente
edited by William E. Griffith
Lexington Books, 1976
 Buku Teks SO
Marriott, J.A.R.
The evolution of Prussia : the making of an empire / by J.A.R. Marriott and Charles Grant Robertson
Clarendon Press, 1953
 Buku Teks SO
Contemporary Georgian fiction
Elizabeth Heighway, translated and edited
Dalkey Archive Press, 2012
 Buku Teks SO
Ridley, Mark
Evolution
Blackwell, 1993
 Buku Teks SO