Clash of Champions: Spassky vs. Petrosian

For the first time since Alekhine, there was a world champion not named "Botvinnik" who was also not merely renting the title for a year. The Armenian named Tigran Petrosian held the title of world champion, with his unusual, "left-handed" style of quiet positional play and sharp tactics. Petrosian's

Botvinnik - Tal World Championship Match (1960) chess event

Clash of Champions: Spassky vs. Petrosian

Smyslov-Spassky (29th USSR-ch, Baku 1961), with annotations by Petrosian.

Piscator Rex: the chess tragedy of Bobby Fischer

Carlsen Vs Karjakin World Chess Championship - Lev Alburt & Jon Crumiller (2017) PDF, PDF, World Chess Championships

Why did Petrosian stop playing the Petroff

Welcome to Elk and Ruby Publishing House

1972 Fischer/Spassky: The Match, Its Origin, and Influence by World Chess Hall of Fame - Issuu

Petrosian vs Spassky, World Championship match 1966, Queen Sac