↑Steele, David Ramsay. From Marx to Mises: Post Capitalist Society and the Challenge of Economic Calculation. — Open Court, 1999. — ISBN 978-0875484495.. — «Marx distinguishes between two phases of marketless communism: an initial phase, with labor vouchers, and a higher phase, with free access.».(англ.)
↑Busky, Donald F. Democratic Socialism: A Global Survey. — Praeger, 2000. — ISBN 978-0275968861.. — «Communism would mean free distribution of goods and services. The communist slogan, 'From each according to his ability, to each according to his needs' (as opposed to 'work') would then rule».(англ.)