Cita APA

De Blij, H. J., Webster, G. R., & Webster, R. H. (1987). The earth: A physical and human geography. New York: J. Wiley & Sons.

Citación estilo Chicago

De Blij, Harm J., Gerarld R. Webster, y Roberta Haven Webster. The Earth: A Physical and Human Geography. New York: J. Wiley & Sons, 1987.

Cita MLA

De Blij, Harm J., Gerarld R. Webster, y Roberta Haven Webster. The Earth: A Physical and Human Geography. New York: J. Wiley & Sons, 1987.