Petrosian - Spassky World Championship Match (1969) chess event
Por um escritor misterioso
Descrição
Fischer Will Challenge World Chess Champion - Los Angeles Times Archive
World Chess Championship 1969 - Wikipedia
Nikolai Krogius, Adviser in Chess 'Match of the Century,' Dies at 91 - The New York Times
Anatoly Karpov at the 41st USSR Championship (Moscow, 1973).
World Chess Championship - The History, Top Champions, and Interesting Facts
Petrosian - Spassky World Championship Match 1969 - Chessentials
World Chess Champions, Chess Wiki
ChessBites - World Champions - Tigran Petrosian
Petrosian - Spassky World Championship Match 1969
