Principles of economics;
an introductory volume,
by Alfred Marshall.

APA Citation

Marshall, A. (1920). Principles of economics: an introductory volume. 8th ed. London: Macmillan.

MLA Citation

Marshall, Alfred, 1842-1924. Principles of Economics: an Introductory Volume. 8th ed. London: Macmillan, 1920.

Warning: These citations may not always be complete (especially for serials).