Cita APA (7th ed.)

Henderson, W., & ed. Engels: Selected writings, History, Economics, Social Cristicism, Philosophy, Letters. Penguin.

Cita Chicago (17th ed.)

Henderson, W.O, i ed. Engels: Selected Writings, History, Economics, Social Cristicism, Philosophy, Letters. Baltimore: Penguin.

Cita MLA (9th ed.)

Henderson, W.O, i ed. Engels: Selected Writings, History, Economics, Social Cristicism, Philosophy, Letters. Penguin.