Cita APA (7a ed.)

Valentine, L. M., & Ellis, D. F. (1991). Business cycles and forecasting (8th ed.). South-Western Publishing Co.

Cita Chicago Style (17a ed.)

Valentine, Lloyd M., y Dennis F. Ellis. Business Cycles and Forecasting. 8th ed. Cincinnati [etc.]: South-Western Publishing Co, 1991.

Cita MLA (9a ed.)

Valentine, Lloyd M., y Dennis F. Ellis. Business Cycles and Forecasting. 8th ed. South-Western Publishing Co, 1991.