Columbia subject headings:
Engels, Friedrich, 1820-1895--Criticism and interpretation.
Marx, Karl, 1818-1883--Criticism and interpretation.
Marx, Karl, 1818-1883. Deutsche Ideologie.
Harvard subject headings:
Communism.
Engels, Friedrich, 1820-1895
Idealism.
Marx, Karl, 1818-1883. Deutsche Ideologie
Philosophy, Marxist.
Socialism.
Princeton subject headings:
Engels, Friedrich, 1820-1895--Criticism and interpretation..
Marx, Karl, 1818-1883--Criticism and interpretation.
Marx, Karl, 1818-1883. Deutsche Ideologie.