In 1925, alongside other IMRO members, Rizov participated in Vienna in the founding conference of IMRO (United).[19][20] He became a member of the Central Committee of the organization.[21][22]
^БКП, Коминтернът и македонския въпрос (1917-1946). Sofia. 1999. p. 1039.{{cite book}}: CS1 maint: location missing publisher (link)
^Ristovski, Blaze (1996). Dimitrija Čupovski i makedonskata nacionalna svest. The University of Michigan. p. 254.{{cite book}}: CS1 maint: location missing publisher (link)
^Pavlovski, Jovan (2006). Ми-Анова енциклопедија: Р-Ш. Skopje. p. 1424.{{cite book}}: CS1 maint: location missing publisher (link)
^Popovski, V. T. (1999). Македонский вопрос в документах Коминтерна: ч. 1. 1923-1925 гг. p. 756.
^Popovski, Vlado (1999). Makedonskoto prašanje vo dokumentite na Kominternata: ch.1. 1923-1925 gg. D. Vlakhov gave the following characteristic of R. Rizov: "Rizo Rizov from Veles, a great Macedonian hero, comrade in arms of Delchev, founder, together with Panko Brashnarov, of our Macedonian revolutionary organization VMRO (United)
^Paleshutski, Kostandin (1983). Makedonskii︠a︡t vŭpros v burzhoazna I︠U︡goslavii︠a︡ 1918-1941. Sofia. p. 171.{{cite book}}: CS1 maint: location missing publisher (link)
^Стефан Дечев: Две държава, две истории, много „истини“ и една клета наука - трета част. Marginalia, 15.06.2018.
^Ristovski, Blaze (1983). Kotcho Ratsin : recherches historiques et littéraires. p. 32.
^Gorgiev, Vancho (2007). Петар Поп Арсов : прилог кон проучувањето на македонското националноослободително движење. University of Michigan. p. 131.{{cite book}}: CS1 maint: location missing publisher (link)
^Силянов, Христо, „Освободителнитѣ борби на Македония, II“, стр.297
^Pandevski, Manol (1983). Vnatrešnata makedonska revolucionerna organizacija i neovrhovizmot, 1904-1908. University of Michigan. p. 139.{{cite book}}: CS1 maint: location missing publisher (link)
^Martulkov, Alekso (1954). My Participation in The Macedonian Revolutionary Battle. Skopje. p. 266.{{cite book}}: CS1 maint: location missing publisher (link)
^Ristovski, Blaze (1978). Dimitrija Čupovski (1878-1940) i Makedonskoto naučno-literaturno drugarstvo vo Petrograd. the University of Michigan. p. 49.{{cite book}}: CS1 maint: location missing publisher (link)
^Cvetovska, Nadezhda (1990). Political activity of the Macedonian emigrants in Bulgaria from 1918 to 1929. the University of California. p. 149.{{cite book}}: CS1 maint: location missing publisher (link)
^Makedonija: ilustrirano spisanie na Maticata na iselenicite od Makedonija, Issues 429-440. 1989. p. 26.
^Алексо Мартулков, Моето учество во револуционерните борби на Македонија. Скопје 1954. 255-256.
^Ристовский, Блаже. Димитрий Чуповский и македонское национальное сознание, ОАО Издательство „Радуга“, Москва, 1999, с. 76.
^Ristovski, Blaze (1999). Macedonia and the Macedonian People. the University of Michigan. p. 280.{{cite book}}: CS1 maint: location missing publisher (link)
^Katadzhiev, Ivan (2000). Историја на македонскиот народ: Македонија међу Балканските и Втората светска војна (1912-1941). Indiana University. p. 392.{{cite book}}: CS1 maint: location missing publisher (link)
^Pandevski, Manol (1995). Македониjа и Балканот во Петроградското списание "Современник" (1912-1913). the University of Michigan. p. 83.{{cite book}}: CS1 maint: location missing publisher (link)
^Пелтеков, Александър Г. Революционни дейци от Македония и Одринско. Второ допълнено издание. София, Орбел, 2014. ISBN9789544961022, с. 408.