Cita APA

Ackert, P., & Lee, L. (2005). Facts & figures (4. ed.). Boston, Mass.: National Geographic Learning ; Cengage Learning.

Citación estilo Chicago

Ackert, Patricia, y Linda Lee. Facts & Figures. 4. ed. Boston, Mass.: National Geographic Learning ; Cengage Learning, 2005.

Cita MLA

Ackert, Patricia, y Linda Lee. Facts & Figures. 4. ed. Boston, Mass.: National Geographic Learning ; Cengage Learning, 2005.