Cita APA (7a ed.)

Packard, S. S., & Horton, B. (1887). The new Packard commercial arithmetic. S.S. Packard.

Cita Chicago Style (17a ed.)

Packard, S. S., y Byron Horton. The New Packard Commercial Arithmetic. New York: S.S. Packard, 1887.

Cita MLA (8a ed.)

Packard, S. S., y Byron Horton. The New Packard Commercial Arithmetic. S.S. Packard, 1887.