Columbia subject headings:
Harvard subject headings:
Communism and society.
Engels, Friedrich, 1820-1895
Engels, Friedrich, 1820-1895--Quotations.
Marx, Karl, 1818-1883
Marx, Karl, 1818-1883--Quotations.
Philosophy, Marxist.
Princeton subject headings:
Engels, Friedrich, 1820-1895--Quotations.
Marx, Karl, 1818-1883--Quotations.
Quotations.