Cita APA (7a ed.)

Lawless, M. J. (1990). Effective sales forecasting: A management tool. [s.n.].

Cita Chicago Style (17a ed.)

Lawless, Mark J. Effective Sales Forecasting: A Management Tool. [S.l.]: [s.n.], 1990.

Cita MLA (9a ed.)

Lawless, Mark J. Effective Sales Forecasting: A Management Tool. [s.n.], 1990.