Cita APA (7th ed.)

Livergood, N. D., & Marx, K. (1967). Activity in Marx's philosophy. Martinus Nijhoff.

Cita Chicago (17th ed.)

Livergood, Norman D., i Karl Marx. Activity in Marx's Philosophy. The Hague: Martinus Nijhoff, 1967.

Cita MLA (9th ed.)

Livergood, Norman D., i Karl Marx. Activity in Marx's Philosophy. Martinus Nijhoff, 1967.