"teleSUR". Diarsipkan dari versi asli tanggal 2011-09-28. Diakses tanggal 2 Maret 2016.
time.com
"During the trial Poum defendants stressed that, while they 'admired Trotsky,' they regarded his Fourth International as too academic and favored a fighting Fifth International." Foreign News: Trotskyists LiquidatedDiarsipkan 2007-10-01 di Wayback Machine. Time Magazine, November 7 1938
"During the trial Poum defendants stressed that, while they 'admired Trotsky,' they regarded his Fourth International as too academic and favored a fighting Fifth International." Foreign News: Trotskyists LiquidatedDiarsipkan 2007-10-01 di Wayback Machine. Time Magazine, November 7 1938
