Political Economy - material product basis of socialism https://marxistleninists.org/Reading%20Guide/On%20Political%20economy/material%20production%20basis%20of%20socialism.htm
Lenin: The Fifth All-Russia Conference of the R.S.D.L.P. https://www.marxists.org/archive/lenin/works/1908/dec/27.htm
Political Economy -circulation of money https://marxistleninists.org/Reading%20Guide/On%20Political%20economy/Circulation%20of%20Money.htm