Cita APA (7a ed.)

Marshall, A., & Guillebaud, C. W. (1961). Principles of economics (9th (variorum) ed.). MacMillan for The Royal Economic Society.

Cita Chicago Style (17a ed.)

Marshall, Alfred, y C. W. Guillebaud. Principles of Economics. 9th (variorum) ed. London [etc.]: MacMillan for The Royal Economic Society, 1961.

Cita MLA (9a ed.)

Marshall, Alfred, y C. W. Guillebaud. Principles of Economics. 9th (variorum) ed. MacMillan for The Royal Economic Society, 1961.