Vladimir Lenin, Collected Works, 4th English Edition, Progress Publishers, Moscow, 1972 V. I. Lenin The Unity Congress of the R.S.D.L.P., "Marxists Internet Archive" (some text is integrated from this source) Protocols of the 4th Congress in Russian
Vladimir Lenin, Collected Works, Edisi Inggris ke-4, Progress Publishers, Moskwa, 1972 V. I. Lenin The Unity Congress of the R.S.D.L.P., “Marxists Internet Archive” (beberapa teks terintegrasi dari sumber ini) Protokol-Protokol Kongres ke-4 dalam bahasa Rusia