Marx, K., & Engels, F. (1975). On religion. Progress Publishers.
Dyfyniad Arddull ChicagoMarx, Karl, and Friedrich Engels. On Religion. Moscow: Progress Publishers, 1975.
Dyfyniad MLAMarx, Karl, and Friedrich Engels. On Religion. Progress Publishers, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.